Answer:
14 m/s
Explanation:
Correct number of sig dig will be two since accel has only two SD ( you can only have as many SD as the factor with the LEAST SD)
v = at
= 2 m/s^2 * 7 s = 14 m/s
why would someone waive their right to a speedy trial?
Some people may give up their rights out of fear or trepidation. However, you must recognize that using your rights is a kind of self-defense, not a challenge to the police.
What is speedy trial?Furthermore, some people assume that exercising Miranda rights implies guilt.Although the right to a speedy trial is guaranteed by the US Constitution, a defendant may gain from renouncing that right. In many cases, the defense will need more time to prepare their case in order to present the best possible defense to the defendant.It is the act of knowingly giving up a legal right such as a rapid trial, a jury trial, or giving up some rights.For more information on speedy trial kindly visit to
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Jess dug a hole 7. 3 inches deep on tuesday. After he dug on wednesday, the hole was 9. 7 inches deep. What distance did jess dig on wednesday?.
Jess dug 2.4 inches distance on Wednesday, depending on the initial and final distance.
The distance dug on Wednesday can be calculated by the following formula:
Distance dug by Jess on Wednesday = Total distance on Wednesday - Distance of hole on Tuesday
Keep the values in formula to find the distance dug by Jess on Wednesday
Distance dug by Jess on Wednesday = 9.7 - 7.3
Performing subtraction on Right Hand Side of the equation
Distance dug by Jess on Wednesday = 2.4 inches
Thus, the distance dug by Jess on Wednesday is 2.4 inches.
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How do you calculate work done by gas in adiabatic process?
The work done by gas in adiabatic process is calculated by
W = [tex]\int\limits^{v_2}_{v_1} {pdV} \, dx[/tex]
where
W is the work done
dV is the change in volumes
P is said to be the pressure of the ideal gas
V1 and V2 are said to be volumes of two different gases
When an ideal gas is compressed adiabatically (Q=0), work is done on it, which raises its temperature; when the gas is expanded adiabatically (Q=0), work is done on it, which lowers its temperature. The cylinders of an automobile truly experience adiabatic compressions because the gas-air combination is compressed there so quickly that there is no time for the mixture to exchange heat with the air around it.
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The work done by gas in adiabatic process is calculated by W = [tex]\int\limits^v_{v2} _ \, pdv dx[/tex]
where W is the work done, dv is the change in volumes, P is said to be the pressure of the ideal gas, V1 and V2 are said to be volumes of two different gases.
The work done by gas in adiabatic process is calculated by W = [tex]\int\limits^v_{v2} _ \, pdv dx[/tex]
where W is the work done, dv is the change in volumes, P is said to be the pressure of the ideal gas, V1 and V2 are said to be volumes of two different gases. When an ideal gas is compressed adiabatically (Q=0), work is done on it, which raises its temperature; when the gas is expanded adiabatically (Q=0), work is done on it, which lowers its temperature. The cylinders of an automobile truly experience adiabatic compressions because the gas-air combination is compressed there so quickly that there is no time for the mixture to exchange heat with the air around it. Adiabatic process is in the process of thermodynamics and it is related to the transfer of the heat part in the thermodynamics section. In this process the heat is transferred in the process without the changing of the any other physical quantity.
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Directions: Analyze the following statements, identify the unknown quantity and show its direction through the use of symbols. Write your answers in one whole sheet of paper. Once done, upload it in the dropbox.
1) A magnetic field points down. A charge moves left to right. What is the direction of the force?
2) A magnetic field points out of the page. A positive charge moves down. What is the direction of the force?
3) A magnetic field points down. A positive charge moves up. What is the direction of the force?
4) The force points down The positive charge moves from right to left What is the direction of the magnetic field?
5) The force points down. The magnetic field points from right to left What is the direction of the velocity of the positive charge.
1.A magnetic field points down (B down) and a charge moves left to right (v right). The direction of the force (F) on the charge due to the magnetic field is up (F up) because it is perpendicular to the velocity and magnetic field (right-hand rule).
2.A magnetic field points out of the page (B out) and a positive charge moves down (v down). The direction of the force (F) on the charge due to the magnetic field is to the left (F left) because it is perpendicular to the velocity and magnetic field (right-hand rule).
3.A magnetic field points down (B down) and a positive charge moves up (v up). The direction of the force (F) on the charge due to the magnetic field is to the right (F right) because it is perpendicular to the velocity and magnetic field (right-hand rule).
4.The force (F down) points down and the positive charge moves from right to left (v left). The direction of the magnetic field (B) is into the page (B into) because it is perpendicular to the velocity and force (right-hand rule).
5.The force (F down) points down and the magnetic field (B left) points from right to left. The direction of the velocity (v) of the positive charge is up (v up) because it is perpendicular to the magnetic field and force (right-hand rule).
How is a magnetic field formed?When an electrically charged particle moves, a magnetic field is created. According to the laws of electromagnetism, this magnetic field originates from the variation in intensity of the electric field.
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as observed from earth, rocket alpha moves with speed 0.90c and rocket bravo travels with a speed of 0.52. they are moving along the same line toward a head-on collision. what is the speed of rocket.alpha as measured from rocket bravo ?
The speed of rocket alpha as measured from rocket bravo is 0.31c due to head-on collision.
In physics, the change in momentum causes a head-on collision. As was already explained, an object's momentum is a property that results from a change in velocity in reaction to an applied force. Before a collision may occur, the momentum must equal zero and this is called head-on collision.
The target particle's velocity following a head-on impact in which the projectile is significantly more massive than the target will be roughly twice that of the projectile, but the projectile's velocity will remain practically unaltered.
speed of rocket alpha=0.90 c
speed of rocket bravo=0.52c
Now, in order to find the speed of rocket alpha measured from rocket bravo =0.90-0.52c
speed=0.31c
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The speed of the rocket alpha when observed from rocket bravo is calculated to be 1.42c.
Alpha rocket is travelling at a speed of 0.90c, while Bravo rocket is flying at a speed of 0.52c.
The two rockets are heading straight at one another in the same direction to collide.
When the rocket's frame of reference is the Bravo rocket, the rocket's speed can both be perceived from the earth's perspective and
Therefore, the rocket Bravo is moving, and the rocket Alpha will approach it more quickly.
If Rocket Alpha's speed is V₁ and Rocket Bravo's speed is V₂, then Rocket Alpha's speed from Rocket Bravo is V₁₂.
V₁₂ = 0.52 -(-0.90)
V₁₂ = 1.42c
Therefore, the rocket alpha's speed from the rocket bravo is 1.42c.
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What is the mass-to-light ratio of a 1.1 Msun white dwarf luminosity 0.001 Lsun? Here Msun is the mass of the Sun, and Lsun is the Sun's luminosity.
the mass-to-light ratio of a 1.1 Msun white dwarf luminosity 0.001 Lsun is [tex]\frac{M_{ws} }{L_{ws} } =1100 Y_{o}=5.6\times 10^{6}[/tex]kg/watt
A light-emitting object's radiant power, which is measured in absolute terms as luminosity, is the electromagnetic power that it radiates out over time.. The total quantity of electromagnetic energy released by a star, galaxy, or other celestial object in a given amount of time is measured as luminosity in astronomy.
Luminosity is expressed in joules per second, or watts, in SI units. Values for luminosity in astronomy are frequently expressed in terms of the luminosity of the Sun. The absolute bolometric magnitude (Mbol) of an object is a logarithmic measure of its total energy emission rate, whereas the absolute magnitude is a logarithmic measure of the luminosity within a given wavelength range or filter band. Luminosity can also be expressed in terms of the astronomical magnitude system.
Mass of white dwarf [tex]M_{ws}[/tex]=1:1
Where msun is the mass of sun
and luminosity of white dwarf [tex]L_{ws}[/tex]=0.001
where Lsun is the luminosity of the sun
mass to light ratio=[tex]\frac{M}{L}[/tex]
for sun, [tex]\frac{Msun}{Lsun}[/tex]=[tex]Y_{o}[/tex]= [tex]\frac{1.989\times 10^{30}kg }{3.867\times 10^{26} watt}[/tex]
[tex]\frac{Msun}{Lsun}[/tex]=[tex]Y_{o}[/tex]= 5133kg/watts
Hence, [tex]\frac{M_{ws} }{L_{ws} } =\frac{1.1M_{sun} }{0.001L_{sun}} =1100\frac{M_{sun} }{L_{sun}}[/tex]
, [tex]\frac{M_{ws} }{L_{ws} } =1100Y_{o}[/tex]
, [tex]\f{M_{ws} }=1100\times5133[/tex]kg/watt
[tex]L_{sun}=5.6\times 10^{6}[/tex] kg/watt
Hence, [tex]\frac{M_{ws} }{L_{ws} } =1100 Y_{o}=5.6\times 10^{6}[/tex]kg/watt
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The use of informal diction in a farewell to arms robs the passage of having a deeper meaning. Helps to maintain the realism of the dialogue. Lends an air of absurdity to the dialogue. Reduces the readability of the passage.
Answer:
helps to maintain the realism of the dialogue
Explanation:\
Among discovered meteorites, we have found some with all the following origins EXCEPT... A. Being a fragment of a shattered asteroid. B. Being a fragment from the surface of the Moon. C. Being a fragment from Cornet Halley. D. Being a fragment from the surface of Mars.
We have discovered meteorites with ALL of the following sources, EXCEPT one being a piece of the comet Halley, among the identified meteorites.
Where do most meteors come from? Most meteors come from what place?Our solar system is where all meteorites originate. Most of them are pieces of ancient asteroids that shattered into smaller pieces in the asteroid belt, which is situated between Mars and Jupiter.
How did asteroids get their start?Asteroids are remains of the solar system's creation, which occurred around 4.6 billion years ago. Early on, the formation of Jupiter stopped any planetary bodies from forming in the space between Mars and Jupiter, causing the small particles that were already present to smash and shatter into the asteroids we know today.
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Mr. Starr pushed a cart full of groceries to his car. After emptying the cart, he pushed it back to the store. He pushed the cart
at a speed of 2 meters per second each way. Which is the best prediction? (1 point)
The cart had the same kinetic energy going each way.
The cart's kinetic energy depends on Mr. Starr's mass.
When it was empty, the cart had less kinetic energy.
When it was full, the cart had less kinetic energy.
Answer:
The shopping cart has less kinetic energy when it is empty.
Explanation:
When an object of mass [tex]m[/tex] travels at a speed of [tex]v[/tex], the kinetic energy of that object would be [tex](1/2)\, m\, v^{2}[/tex].
In this question, the speed of the shopping cart is fixed ([tex]v = 2\; {\rm m\cdot s^{-1}}[/tex].) Kinetic energy would be proportional to the mass [tex]m[/tex] of the shopping cart (including that of its contents.)
The mass of the shopping cart is lower when it is empty on the way back to the store. Therefore, the kinetic energy of the shopping cart would also be lower than when it was full.
Answer:
(Question) A city gets its electricity from a dam, where water is stored in a reservoir. How does the water provide the city with its power?
(Answer) Potential energy in the water becomes kinetic energy as it moves through turbines, which turn kinetic energy into mechanical energy that spins a generator, which changes mechanical energy into electricity.
(Question) An acorn rolls off a roof and falls to the ground. Which statement best describes the change in energy?
(Answer) The acorn’s potential energy decreases as its kinetic energy increases.
(Question) An airplane carries 320 passengers from Phoenix to Los Angeles flying at an average speed of 490 miles per hour. On the return flight, the plane carries 164 passengers and travels at the same average speed. What happens to the plane’s kinetic energy?
(Answer) On the return flight, the plane has less kinetic energy.
(Question) A racehorse is running at 42 miles per hour, equivalent to 18.8 meters per second. The horse and its jockey have a combined mass of 512 kilograms. How much kinetic energy do they have?
(Answer) 90,480.6 J
(Question) Which object has kinetic energy?
(Answer) balloon rising in the sky
(Question) Mr. Starr pushed a cart full of groceries to his car. After emptying the cart, he pushed it back to the store. He pushed the cart at a speed of 2 meters per second each way. Which is the best prediction?
(Answer) When it was empty, the cart had less kinetic energy.
(Question) A student fires a toy rocket into the sky. When does the rocket have the most potential energy?
(Answer) when the rocket reaches its highest point
(Question) What is the best description of one billiard ball hitting a second billiard ball?
(Answer) Most of the kinetic energy in the first ball is transferred to the second ball.
(Question) A roller-coaster car is at the top of a hill. The car and its passengers have a combined mass of 1,088 kilograms. If the hill is 62 meters tall, how much potential energy does the car have?
(Answer) 661,068.8 J
(Question) A roller-coaster is at the top of a 62-meter hill. The car and its passengers have a total mass of 1,088 kilograms. By the time the car reaches the bottom of the hill, its speed is 74 miles per hour (33 meters per second). How much kinetic energy does the car have at the bottom of the hill?
(Answer) 592,416 J
(Question) A diagram is drawn showing a swing set with a swing pulled backward prior to release. The diagram shows how the swing will move forward and then backward after it is initially released. At which point in the diagram is all of the energy gravitational potential energy?
(Answer) when the swing is pulled back prior to release
(Question) essay
(Answer) good luck
(Question) essay
(Answer) good luck
Explanation:
I just completed this assignment UwU
QUESTION 1
When properly climbing a ladder, the firefighter should look:
When properly climbing a ladder, the firefighter should always look forward with his or her arms straight, grasping alternate rungs.
What safety precaution should be taken when heeling a ladder?When someone is climbing a ladder, look ahead, not up. Floor ladder integration includes: Secure the ladder to a stationary object using a rope hose tool or safety belt.(Both hands and one foot or both feet and one hand) Contact while climbing a ladder. Keep your body near the middle of the step and always face the ladder when climbing (see image). Use ladders and related accessories (ladder levelers, jacks or hooks) only for their intended purpose. rungs, steps, or feet.Keep wires away from power lines and live electrical wiring. Despite these and other warnings, electrocution deaths still occur each year. To avoid this hazard, the CPSC recommends using non-conductive ladders, such as ladders, when working near overhead power lines, fiberglass with non-conductive side rails.To know more about firefighter, visit:
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Complete Question is as follows:
When properly climbing a ladder, the firefighter should look:
Select one:
a. toward the ladder tip with feet placed toward the center of the rungs.
b. forward and place his or her feet toward the center of the rungs.
c. toward the ladder tip and the beams.
d. forward with his or her arms straight, grasping alternate rungs.
suppose the distance from the lens system of the eye (cornea + lens) to the retina is 17 mm.
A) The power of the lens be when looking at distant objects is 58.823 D
B) The power of the lens be when looking at an object 20.0 cm from the eye is 63.823 D
According to the Dictionary of Ophthalmic Optics, the definition is stated thus: “The straight line measurement in millimeters (z axis) from the back or ocular surface vertex of a mounted spectacle lens to the apex of the cornea.” For a more practical definition, it is the straight line distance in millimeters from the back surface of any lens (mounted in spectacles or not) to the apex of the cornea.
(a) Power 1/p
= 1/f
= 1/ .017 m
= 58.823 D
(b) 1/q + 1/p
= (1/0.20 m) + (1/.017 m)
= 63.823 D
The given question is incomplete, the complete question is
Suppose the distance from the lens system of the eye (cornea +lens) to the retina is 17 mm.
(a) What must the power of the lens be when looking at distant objects?
(b) What must the power of the lens be when looking at an object 20.0 cm from the eye?
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a galaxy with little cool gas or dust and no evidence of ongoing star formation is most likely a(n)
A galaxy with little cool gas or dust and no evidence of ongoing star formation is most likely an elliptical galaxies.
Most brilliant galaxies are spiral galaxies that have been compressed. But a sizable portion of brilliant galaxies are elliptical galaxies. Elliptical galaxies have relatively little gas and dust, and what little gas and dust they do have is hot and diffuse. As a result, star formation is not currently occurring in elliptical galaxies. Old Population II stars make up the stars in elliptical galaxies. Ellipsoidal galaxies Do Not rotate quickly, in contrast to the disks of spiral and lenticular galaxies.The majority of elliptical galaxies are made up of older, low-mass stars, have a scant interstellar medium, little star formation, and are frequently ringed by numerous globular clusters. Elliptical galaxies aren't the most prevalent type of galaxy in the cosmos, accounting for only about 10-15% of galaxies in the Virgo Supercluster. They are more frequently discovered close to the galactic cluster centers.
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It is diffraction that limits the ________ of a telescope of a given objective diameter.A) apertureB) light graspC) resolutionD) magnificationE) interference
It is diffraction that limits the resolution of a telescope of a given objective diameter
Diffraction can be defined as spreading of waves in the presence of obstacles
The resolving power of a telescope can be calculated by the formula,
resolving power = 11.25 seconds of arc/ d,
When we use a telescope the very close objects such as stars or galaxies very small angles on the telescope. To determine the resolution of them on the telescope we need telescopes which have large aperture and therefore we can use resolving power here.
Thus, higher the diameter between objects, the better is the resolution of telescope.
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What inferences can you make about the floating nail?
Therefore the weight of the nail is more than the buoyant force or the upthrust experienced by the nail.
Can a nail float on water?As the thickness of an iron nail is more than that of water, the nail sinks in water. But a big ship made of iron floats. This is because of its form. With clubbing, the root is part of the bone by combinable tissue and edema; pressure upon the nail plate walks it toward the bone. The base of the nail becomes strong and springy, and the nail feels as if it is afloat on a cushion.
In the case of the iron nail, the weight of the needle is more than the weight of the water replacement. Hence nail sinks and ship floats. When an object is partially or fully immersed in a liquid, the liquid applies a force on the object. This forced use is known as buoyant force or buoyancy.
So we can conclude that the weight of iron nails is more than the density of water. Hence, it will sink into the water.
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when a proton is traveling at 0.80c, what is the ratio of its kinetic energy to its rest energy? A.60 B.1.2 C.0.80 D.1.7 E.0.67
The ratio of its kinetic energy to its rest energy will be D) 1.7
When a proton is traveling at a velocity of 0.80c, the ratio of its kinetic energy to its rest energy can be calculated using the equation E_k/E_0 = (γ - 1).
Here, γ is the Lorentz factor, which is calculated by γ = 1/√(1 - v^2/c^2). Substituting 0.80 for v and 3x10^8 for c, we get γ = 5.
Therefore, the ratio of kinetic energy to rest energy is 4 (γ - 1), or 4(5 - 1), which is equal to 16. Therefore, the correct answer is D: 1.7.
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the spheres at points x and y have masses in the same ratio as the magnitudes of their charges. the isolines of gravitational potential for the spheres have shapes similar to those of the isolines shown. explain why the two sets of isolines have similar shapes.
Both spheres would gravitationally attract a third sphere just like two charges of the same sign would attract a third charge of the opposite sign.
What are spheres?A sphere is symmetrical, round in shape. It is a three dimensional solid, that has all its surface points at equal distances from the center. It has surface area and volume based on its radius.
How is a sphere formed?A sphere can be constructed as the surface formed by rotating a circle about any of its diameters; this is essentially the traditional definition of a sphere as given in Euclid's Elements. Since a circle is a special type of ellipse, a sphere is a special type of ellipsoid of revolution.
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Read the excerpt from paragraph 1.
Apollo 14 launched in the late afternoon of January 31, 1971, on what was to be our third trip to the lunar surface. Five days later Alan
Shepard and Edgar Mitchell walked on the Moon while Stuart Roosa, a former U.S. Forest Service smoke jumper, orbited above in the
command module.
What is the meaning of the phrase command module as it is used in the excerpt?
A. the part of a spacecraft that contains support systems
B. a satellite designed to orbit the Moon
C. the detachable part of a spacecraft
D.the detachable part of a spacecraft
a satellite designed to hold a human astronaut
Answer: The detachable part of a spacecraft
Explanation:
Answer:
C.
Explanation:
detachable part of a spacecraft
What is the 3rd Law of coilation?
1. Bounce
2. Gravity
3. Re-flux
Answer:
Re-flux
Explanation:
the magnetic field in the figure is decreasing at the rate 0.7 t/s . (figure 1)
The magnitude of the acceleration of a proton at rest at point a is [tex]3.35\times10^{5} m/s[/tex]
The concepts of Faraday's law, Ampere's law, Lenz's law, and the right-hand thumb rule are needed to solve this problem. First, determine the relationship between the electric field and the rate of change of the magnetic field using Faraday's law and Ampere's law. Discover the expression of a proton's acceleration at various sites by using the relationship between force and the dielectric field.
[tex]\frac{dB}{dT} =0.7T/sec[/tex]
F=ma=qE
a= [tex]\frac{qE}{m}[/tex]
a = [tex](\frac{qr}{2m})\times(\frac{dD}{dt} )[/tex]
a=[tex]\frac{1.6\times10^{-19}\times0.01\times0.7 }{2\times1.67\times10^{-27} }[/tex]m/[tex]sec^{2}[/tex]
a=[tex]3.35\times10^{5}[/tex]m/[tex]sec^{2}[/tex]
Direction:Up
a = 0 as r = 0
direction: No acceleration.
a=[tex]3.35\times10^{5}[/tex]m/[tex]sec^{2}[/tex]
Direction: Down
a=[tex]\frac{1.6\times10^{-19}\times0.02\times0.7 }{2\times1.67\times10^{-27} }[/tex]m/[tex]sec^{2}[/tex]
a=[tex]-6.7\times 10^{5}[/tex]m/[tex]sec^{2}[/tex]
Direction:Down.
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a man traveled 2.2 in to the store in 5.0 minutes and then stayed at the store for 10.0 minutes. he than traveled 6.1 kn to the bank in 12 minutes and stayed in the bank for 5.0 minutes. he than travelled 4.7 km to his home in 7.0 minutes. what was his average speed in units of km/min
The speed of the man is obtained as 0.54 Km/min.
What is the average speed?One of the first things that must come to our minds is that fact that speed is a scalar quantity and as such we do not look at the direction of the movement of the object but just the algebraic sum.
We then have that;
Total distance = 2.2 + 6.1 + 4.7 = 13 Km
Total time = 5 + 12 + 7 = 24 min
Note that we do not count the times that were spent in the store without moving
The speed is now; = 13 Km/24 min
= 0.54 Km/min
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Two objects are dropped from a bridge, an interval of 1. 0 s apart. Air resistance is negligible. During the time that both objects continue to fall, their separation.
A bridge drops two items at a distance of 1.0 seconds apart. There is very little air resistance. It implies that distance grows with passing time.
Describe resistance.Resistance seems to be the capacity of a chemical to prevent the movement of electrical charge. R, capitalized, serves as its emblem. The most common unit of resistance is the ohm, which is frequently expressed as a syllable and occasionally represented by that of the classical Greek letter omega.
What metrics are used to quantify resistance?Resistance is measured with a device like a multimeter, either analog or digital. Both kinds of instruments are valuable in a variety of applications since they can act a certain way as well as stream, voltage, or other factors.
let first object at t = 0,
initial velocity, u = 0,
1st ball, s1 = 1/2gt²
2nd ball s2 = 1/2 g(t - 1)²
separation between them,
s1 - s2 = 1/2 gt² - 1/2g(t - 1)²
= 1/2 g[t² - t² + 2t - 1]
= 1/2 g(2t - 1)
= separation ∝ (2t - 1)
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An action/reaction pair of forces ....
Select all that are True.
act on the same object.
point in the opposite direction.
act on two different objects.
point in the same direction.
Action-reaction pairs are forces that operate on separate objects in opposing directions and at identical magnitudes. Never do they affect the same thing. We learn that forces are interactions from Newton's third law.
An action-reaction pair is what?When two bodies contact, they exert an equal and opposite force on one another in accordance with Newton's third rule of motion. Action-reaction forces are made up of these forces.
What do action and reaction forces look like in practice?Think about how a baseball bat and a ball interact, for instance. The bat forces the ball to the right while the baseball forces the bat to the left. The action-reaction force pair is made up of these two forces acting on two separate objects together.
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Units of power include which of the following?
I) Watt
II) Joule per second
III) Kilowatt-hour
a) I only
b) III only
c) I and II only
d) II and III only
e) I, II, and III
Answer:
c) I and II only
Explanation:
Power is measured in Watts(W) and Joules per second (J/s)
Answer:
(C) the definition of a watt is joule / sec which is a unit of power
a kilowatt-hour is the definition of 1000 watts over a period of 1 hr which is a unit of energy
Which type of mirror can form a real image?
Concave mirror forms real images.
Virtual images are formed in Plane mirror and convex mirrors. Concave mirrors can form real images. Real image are basically visible on a screen. Real images are produced by projectors. 'Intersection of the rays' causes the formation of the real images and the virtual images are formally basically by 'diverging rays'. A concave mirror is also called as the converging mirror. It has a surface which is reflecting that is 'recessed inward'. Concave mirrors commonly 'inward the reflected light to one focal point'. Concave mirrors are commonly utilized to 'focus light'. If a screen is placed in the plane of a real image the image will generally become visible on the screen.
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A mirror that can form a real image is said to be a concave mirror.
Virtual images are formed in plane mirror and convex mirrors. Concave mirrors can form real images. Real image are basically visible on a screen. Real images are produced by projectors. Intersection of the rays causes the formation of the real images and the virtual images are formally basically by diverging rays.
A concave mirror is also called as the converging mirror. It features a reflective surface that is recessed inward. Commonly, concave mirrors focus the reflected light at one focal point inside. Mirrors with concave surfaces are commonly used to focus light. An actual image will typically appear on a screen if it is positioned in the plane of the real image.
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Two plane mirrors meet at a 135º angle (see Figure 1). If light rays strike one mirror at an angle of 38 º, as shown, at what angle ϕ do they leave the second mirror?
The light rays leave the second mirror at an angle of 173º.
The angle of incidence of light rays striking the first mirror is 38º. When light strikes a mirror, the angle of incidence is equal to the angle of reflection.
So, the angle of reflection of the light rays striking the first mirror is also 38º.
The two mirrors form a 135º angle, and the angle of reflection of the light rays is 38º. So, if we add those two angles together, we get:
38º + 135º = 173º
The light rays leave the second mirror at an angle of 173º. Therefore, the angle ϕ is equal to 173º.
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The allowed energies of a simple atom are 0.0 eV, 4.0 eV, and 6.0 eV.Part A. What wavelength(s) appear(s) in the atom's emission spectrum? If there is more than one answer, enter your answers in ascending order separated by commas.Part B. What wavelength(s) appear(s) in the atom's absorption spectrum? If there is more than one answer, enter your answers in ascending order separated by commas.
The wavelength appear in the atom's emission spectrum and atom's absorption spectrum are determined to be 3.1 x 10^-7m and 2.1 x 10^-7 m respectively.
A spectrum of atomic emission lines: what is it?When light is dispersed into its various frequencies by a prism, a pattern of lines called an atomic emission spectrum is the result. The hydrogen atomic emission spectrum is depicted in the figure below.
Planck's theory:
E = hc/λ;
h => planck's constant
λ => wvelength
for 4eV:
λ = hc/E
=> 6.626 x 10^-34 x 3 x 10^8/ 4 x 1.602 x 10^-19
=> 3.1 x 10^-7m
for 6 eV:
=> 6.626 x 10^-34 x 3 x 10^8/ 6x 1.602 x 10^-19
=> 2.1 x 10^-7 m
How is a spectrum of atomic absorption created?When light is transmitted through a cold, diluted gas, the gas's atoms absorb at specific frequencies, creating an absorption spectrum. Since the re-emitted light is unlikely to go in the same route as the absorbed photon, this leads in dark lines (absence of light) with in spectral region.
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The speed of sound in air is about 340 m/s. What is the wavelength of sound waves
produced by a guitar string vibrating at 490 Hz? Show your work.
the answer is 0.693m.
step by step explanation:
The speed of sound, the frequency and the wavelength is related by the equation:
v= f λ
speed of sound is v=340ms⁻¹
frequency is f=490Hz
wavelength is λ= v/ f
λ=340/490
λ=0.693m
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Two students push a car out of the mud. One pushes with 10 Newtons, the other with 7
Newtons. Will they overcome the friction force of 15 Newtons?
Answer:
The students will be able to overcome the friction force if the combined force they apply is greater than 15 Newtons. To find the combined force, you can add the forces applied by each student: 10 Newtons + 7 Newtons = 17 Newtons. Since 17 Newtons is greater than 15 Newtons, the students will be able to overcome the friction force and push the car out of the mud.
Explanation:
find a taylor polynomial of order 3, t3(x) centered at a = 0 for the function f(x) = 9x + e −4x .
The Taylor polynomial of order 3, t3(x) centered at a = 0 for the function f(x) = 9x + e −4x is [tex]1 + 5x - 2x^2 + 10.66666x^3[/tex].
To find the Taylor polynomial of order 3, t3(x) centered at a = 0 for the function f(x) = 9x + e −4x, we need to find the function's value, first derivative, second derivative, and third derivative at a = 0, and then plug them into the Taylor series formula.
The function's value at a = 0 is:
f(0) = [tex]1 + 5x - 2x^2 + 10.66666x^3[/tex] = 0 + 1 = 1
The first derivative at a = 0 is:
f'(x) = 9 - [tex]4e^{(-4x)}[/tex]
f'(0) = 9 - [tex]4e^0[/tex] = 9 - 4 = 5
The second derivative at a = 0 is:
f''(x) = [tex]-16e^{(-4x)} + 4^{2x(-1)}[/tex]
f''(0) = [tex]-16e^{(-4(0))} + 4^{2(0)(-1)}[/tex] = -16 + 0 = -16
The third derivative at a = 0 is:
f'''(x) = [tex]-16e^{(-4(0))} + 4^{2(0)(-1)}[/tex]
f'''(0) = 64e^(-4(0)) + 4^3(0)(1) = 64 + 0 = 64
Now we can plug these values into the Taylor series formula:
t3(x) = [tex]f(0) + f'(0)x + (f''(0)/2!)x^2 + (f'''(0)/3!)x^3[/tex]
t3(x) = 1 + 5x + (-16/2!)[tex]x^2[/tex]+ (64/3!)[tex]x^3[/tex]
= 1 + 5x - 2x^2 + (64/6)[tex]x^3[/tex]
= 1 + 5x - 2x^2 + (64/6)[tex]x^3[/tex]
= 1 + 5x - 2x^2 + 10.66666[tex]x^3[/tex]
So the Taylor polynomial of order 3, t3(x) centered at a = 0 for the function f(x) = 9x + e −4x is:
t3(x) = [tex]1 + 5x - 2x^2 + 10.66666x^3[/tex]
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Compared to the filament thickness of a 60-W light bulb,the filament of a 100-W light bulb will be
A)thinner.
B)thicker.
C)the same.
The filament of a 100-W light bulb will be thicker compared to the filament thickness of a 60-W light bulb.
The filament of a light bulb is directly proportional to the electrical power passing through it. In other words, the thicker the filament, the less electrical power is needed to heat it to the point of incandescence, and the less intense the light will be.
So, the filament of a 100-W light bulb will be thicker than the filament of a 60-W light bulb, because it needs less electrical power to produce the same amount of light. This is due to the fact that the 100-W bulb filament is designed to withstand higher temperatures than the 60-W bulb filament in order to emit the same amount of light.
It's worth noting that the thickness of the filament doesn't only depend on the power of the bulb but also on the kind of bulb, the material of the filament and the temperature they are designed to operate at.
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