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Related Questions
Need help in the middle one
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Answer:
Guysi hate math answer this guy plsss ssss
9) A rock is projected upwards from the surface of the moon at time t = 0.0 s with a velocity of 30 m/s (the acceleration due to gravity at the surface of the moon is -1.62 m/s2. The rock rises, then falls and strikes the ground. Consider all quantities as positive in the upward direction. What is the velocity during accent at 180 m above the surface? At time t = 10 s, what is the height of the rock from the ground?
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Answer:
a) The velocity of the rock during ascent at 180 meters above the surface is approximately 17.799 meters per second.
b) The height of the rock from the ground is 219 meters from the ground.
Explanation:
a) The rock experiments a free fall, in which this element is projected upwards, decelerated until rest is reached and then it falls down. Please notice that free fall is a case of uniformly accelerated motion, in which object is accelerated by gravity. The velocity of the rock is described by the following kinematic equation:
[tex]v = \sqrt{v_{o}^{2}+2\cdot a\cdot \Delta s}[/tex] (1)
Where:
[tex]v_{o}[/tex] - Initial velocity, measured in meters per second.
[tex]v[/tex] - Final velocity, measured in meters per second.
[tex]a[/tex] - Gravitational acceleration, measured in meters per square second.
[tex]\Delta s[/tex] - Travelled distance, measured in meters.
If we know that [tex]v_{o} = 30\,\frac{m}{s}[/tex], [tex]a = -1.62\,\frac{m}{s^{2}}[/tex] and [tex]\Delta s = 180\,m[/tex], then the velocity during ascent at 180 meters is:
[tex]v =\sqrt{\left(30\,\frac{m}{s} \right)^{2}+2\cdot \left(-1.62\,\frac{m}{s^{2}}\right)\cdot (180\,m) }[/tex]
[tex]v \approx 17.799\,\frac{m}{s}[/tex]
The velocity of the rock during ascent at 180 meters above the surface is approximately 17.799 meters per second.
b) The height of the rock is calculated from this kinematic formula:
[tex]s = s_{o}+v_{o}\cdot t +\frac{1}{2}\cdot a \cdot t^{2}[/tex] (2)
Where:
[tex]s_{o}[/tex] - Initial position of the rock, measured in meters.
[tex]s[/tex] - Final position of the rock, measured in meters.
[tex]v_{o}[/tex] - Initial velocity of the rock, measured in meters per second.
[tex]t[/tex] - Time, measured in seconds.
[tex]a[/tex] - Acceleration, measured in meters per square second.
If we know that [tex]s_{o} = 0\,m[/tex], [tex]v_{o} = 30\,\frac{m}{s}[/tex], [tex]t = 10\,s[/tex] and [tex]a = -1.62\,\frac{m}{s^{2}}[/tex], then the height of the rock from the ground is:
[tex]s = 0\,m + \left(30\,\frac{m}{s} \right)\cdot (10\,s)+\frac{1}{2}\cdot \left(-1.62\,\frac{m}{s^{2}} \right)\cdot (10\,s)^{2}[/tex]
[tex]s = 219\,m[/tex]
The height of the rock from the ground is 219 meters from the ground.
A student grabs a piece of paper and tears it from the middle. Which statement best explains the forces involved?
a. The friction between the hands and the paper interacts with gravity and causes the paper to tear.
b. The normal force between the molecules of the paper is overcome by the contact force of the hands.
c. The electrostatic forces from the contact of the hands with the paper causes the paper molecules to separate.
d. The magnetic force between the hands and the paper separates the molecules of the paper.
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Answer:
b. The normal force between the molecules of the paper is overcome by the contact force of the hands.
Explanation:
The paper molecules are held together by a weak bond. When the student holds the paper on both sides with the center of the paper in between, the student applies two equal forces in the opposite direction of the paper making the paper molecules weaken and separate.
Answer:
The electrostatic forces from the contact of the hands with the paper causes the paper molecules to separate.
Here's the rest of the answers
1.) Which statement is correct about the strength of forces?
Electrostatic forces are trillions of times stronger than gravitational forces.
2.) A student tries to push a book across a table. Which forces acting on the book are a result of electrostatic forces?
normal force and friction
3.) What type of force can explain how a gecko climbs up a wall?
contact forces
5.) A heavy hammer is sitting on top of a board. Which statement correctly describes why the hammer does not go through the board?
The electrostatic forces between the molecules of the board prevent the force of gravity from breaking the board apart.
The audio power of the human voice is concentrated at about 300 Hz. Antennas of the appropriate size for this frequency are impracticably large, so that to send voice by radio the voice signal must be used to modulate a higher (carrier) frequency for which the natural antenna size is smaller. a. What is the length of an antenna one-half wavelength long for sending radio at 300 Hz
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Answer:
the length of an antenna one-half wavelength long for sending radio at 300 Hz is 500 km
Explanation:
Given the data in the question;
we know that wave length is;
λ = c/f
c is the speed of voice ( 3 × 10⁸ m/s )
frequency f = 300 Hz
so we substitute
λ = 3 × 10⁸ / 300
λ = 1000000 m
we know that; 1 km = 1000 m
so
λ = 1000000 m / 1000
λ = 1000 km
hence, an antenna one-half wavelength will be;
λ /2
= 1000 km / 2
= 500 km
Therefore, the length of an antenna one-half wavelength long for sending radio at 300 Hz is 500 km
If the grasses have 100 units of energy, how much can be passed to the grasshoppers?
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if the radius of the capillary tube is doubled, what changes will take place in the hieght of rise of liquid with capacity tube ?
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Explanation:
The height of the rise of liquid with capillary tube is given by the formula as follows :
[tex]h=\dfrac{2S\cos\theta}{r\rho g}[/tex]
Where
r is radius
It is clear that the height of the rise of liquid is inversely proportional to the radius of the capillary tube.
If the radius of the capillary tube is doubled, it means the height of rise of liquid with capillary tube become half.
A rocket lifts a payload upward from the surface of Earth. The radius of Earth is R, and the weight of the payload on the surface of Earth is W. The force of Earth's gravity on the payload is W/2 when the rocket's distance from the center of the Earth is
A. R
B. sqrt(2)R
C. 2R
D. 2sqrt(2)R
E. 4R
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Answer:
the correct answer is B r =√2 R
Explanation:
To solve this exercise we will use the force of gravity, at two points when the rocket is on the platform and when it is at the desired height.
Rocket with cargo on the platform
[tex]F_{g} = G \frac{ m M }{R^2} = W[/tex]
where m is the mass of the rocket and the charge, M the mass of the earth and R the distance from the center of the earth
Rocket loaded at desired height
[tex]F_{g} = G \frac{m M}{r^2 } = \frac{W}{2}[/tex]
we write our two equations
W = g m M / R²
[tex]\frac{W}{2}[/tex] = G m M / r²
we match to solve them
Gm M / R² = 2 Gm M / r²
1 / R² = 2 / r²
r =√2 R
therefore the correct answer is B
A projectile fired into the air explodes and splits into two halves of equal mass that hit the ground at the same time. If the projectile had not exploded, it would have landed at point X, which is a distance R to the right of the launch point. After the explosion, one of the halves lands at poit Y, which is a distance 2R to the right of the launch point. If air resistance is negligible, where did the other half land?
(A) To the left of the launch point
(B) At the launch point (q)
(C) Between the launch point and point X
(D) Between points X and Y
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Answer:
B: At the launch point
Explanation:
We are told that after the explosion, one of the halves landed at the point Y, which is a distance 2R to the right of the launch point. Now, if air resistance is negligible, it means the other half will land at the launch point. This is clear from the model projectile motion curve of this explosion I've done in wolfram and attached.
What is the stretch when you pull with a force of 2.3 N on a spring with a spring constant of 19 N/m?
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Answer:
x=0.12 m
Explanation:
Use the equation F=kx and isolate x because that's what you're solving for (x=F/k). Plug in your given values for F and k and solve for x [x=(2.3 N)/(19 N/m)] and you get x=0.12 m.
Which of the following questions could best be answered by the work of
Warren Washington?
A. How will climate change affect the strength of hurricanes in the
future?
B. What is the maximum mass of a stable white dwarf star?
C. How quickly are stars in the Milky Way moving away from Earth?
D. What is the best way to deliver broadband Internet service to rural
areas?
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Answer:
how will climate change affect the strength of hurricanes in the future?
Which depends on your location weight or mass
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Answer:
yes he is true I too believe weight only the mass never changes.
A force of 40N is applied to a 28 g mass, what is the acceleration? (round to the hundredths place)
___________________________________m/s2
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Answer:
1428.6m/s²
Explanation:
Given parameters:
Force applied on the body = 40N
Mass of the body = 28g
1000g = 1kg
28g will therefore be 0.028kg
Unknown:
Acceleration = ?
Solution:
To solve this problem, we use the expression derived from Newton's second law of motion.
Force = mass x acceleration
Insert the parameters and solve;
40 = 0.028 x acceleration
Acceleration = [tex]\frac{40}{0.028}[/tex] = 1428.6m/s²
An archer pulls her bowstring back 0.410 m by exerting a force that increases uniformly from zero to 270 N. How much work is done in pulling the bow?
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Answer:
110.7Joules
Explanation:
Work is said to be done when the force applied to a body cause the body to move through a distance. Mathematically:
Work done = Force * Distance
Given the following
Force = 270 -0 = 270N
Distance moved = 0.410m
Required
The work done
Substitute the given parameters into the formula
Workdone = 270 * 0.41
Workdone = 110.7Joules
Hence the work done in pulling the bow is 110.7Joules
2. A car travels 32 m/s south in 9 seconds. What is the car's displacement ?
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Answer:
3.56m due south
Explanation:
Given parameters:
Velocity of the car = 32m/s
Time = 9s
Unknown:
Displacement of the car = ?
Solution:
The velocity of a body is its displacement per unit of time in a specific direction.
Velocity = [tex]\frac{displacement}{time}[/tex]
So;
Velocity = [tex]\frac{32}{9}[/tex] = 3.56m due south
Pls help. Pure substance vs Mixture
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Answer:
i cant see the picture.
Explanation:
A white dwarf is not continuing in nuclear fusion, yet it still shines brightly for thousands of years because...
o The star is still super hot.
o It reflects light from other sources.
o both of these options
o neither of these options
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Explanation:
Understanding that stars are naturally quite hot, imagine I pulled a piece of hot iron from a furnace. It would glow a bright red, and then slowly fade to black as the iron cools.
White dwarfs glow for the same reason - they are HOT!
I don’t know what to do
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Answer:
So increasing the voltage increases the charge in direct proportion to the voltage. If the voltage exceeds the capacitors rated voltage, the capacitor may fail due to breakdown of the dielectric between the two plates that make up the capacitor.
Explanation:
A option.
An object of mass m moves to the right with a speed v. It collides head-on with an object of mass 3m moving with speed v/3 in the opposite direction. If the two objects stick together, what is the speed of the combined object, of mass 4m, after the collision?
a. 2v
b. v/2
c. 0
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Answer:
Therefore, the correct option is c: 0.
Explanation:
We can find the speed of the combined object by conservation of linear momentum:
[tex] p_{i} = p_{f} [/tex]
[tex] m_{1}v_{1_{i}} + m_{2}v_{2_{i}} = m_{1}v_{1_{f}} + m_{2}v_{2_{f}} [/tex]
Where:
"i" is for initial and "f" is for final
m₁: is the mass of the first object = m
m₂: is the mass of the second object = 3m
v₁: is the velocity of the first object
v₂: is the velocity of the second object
[tex] mv - 3m\frac{v}{3} = (m + 3m)v_{f} [/tex]
[tex] mv - mv = 4mv_{f} [/tex]
[tex] v_{f} = 0 [/tex]
Therefore, the correct option is c: 0.
I hope it helps you!
What causes acid rain?
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Answer:
Acid rain is caused by a chemical reaction that begins when compounds like sulfur dioxide and nitrogen oxides are released into the air. These substances can rise very high into the atmosphere, where they mix and react with water, oxygen, and other chemicals to form more acidic pollutants, known as acid rain.
Answer:
Acid rain is caused by a chemical reaction that begins when compounds like sulfur dioxide and nitrogen oxides are released into the air.
Explanation:
Acid rain results when sulfur dioxide (SO2) and nitrogen oxides (NOX) are emitted into the atmosphere and transported by wind and air currents.
The friends now consider a charged particle with charge q that moves in a region containing a uniform electric field, E, similar to what they've observed in the simulation. They let the length of the plates creating the uniform electric field be L, and the distance between the plates be d. Alston challenges Thana to calculate the maximum speed, v, the charged particle could be moving if it enters the space halfway between and parallel to the two plates and just barely manages to strike one of the plates. Which response is correct
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Answer:
Explanation:
The charged particle will experience a force towards one of the plates , in direction perpendicular to its initial velocity because electric field is between the plates .
The force experienced by it = q E
acceleration a = qE / m , where m is mass of the charged particle .
The particle will have two velocity at the time it leaves the space between plates .
Horizontal velocity = initial horizontal velocity = v .
vertical velocity is created by force qE
Time taken by horizontal velocity to cover distance L
t = L / v
vertical velocity attained V = u + at
0 + at ( time taken by vertical velocity and time taken by horizontal velocity are equal )
vertical velocity = (qE/ m) x (L/v) = qEL / mv
Resultant velocity = [tex]\sqrt{(\frac{v}{1} )^2+(\frac{qEL}{mv})^2 }[/tex]
= [tex]\sqrt{(v^2+(\frac{qEL}{mv})^2 }[/tex]
This gives the magnitude of resultant velocity .
A salmon jumps up a waterfall 2.4 m high. With what minimum speed did the salmon leave the water below to reach the top?
PLEASE HELP I NEED ANSWER BEFORE MIDNIGHT
I WILL MAKE BRAINLIEST
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What is Nature? How does it explain the human condition?
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Answer:
Explained below.
Explanation:
Nature is defined as all of the genes as well as hereditary factors that influence both the physical appearance and personality manifestations of any individual.
For example, a child could inherit certain physical traits and characters from his/her parents which in turn shapes the physique and personality of such an individual in the world.
Two satellites in space with a mass of 2000kg, are 1500m apart from each other. What is the force gravity between them?
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Answer:
F = 1.185 x 10⁻¹⁰ N
Explanation:
The force of gravitation between two objects is given by Newton's Law of Gravitation. According to this law:
[tex]F = \frac{Gm_{1}m_{2}}{r^{2}}\\[/tex]
where,
F = Gravitational Force between satellites = ?
G = Universal Gravitational Constant = 6.67 x 10⁻¹¹ Nm²/kg²
m₁ = m₂ = mass of each satellite = 2000 kg
r = distance between both satellites = 1500 m
Therefore,
[tex]F = \frac{(6.67\ x\ 10^{-11}\ Nm^{2}/kg^{2})(2000\ kg)(2000\ kg)}{(1500\ m)^{2}}\\\\[/tex]
F = 1.185 x 10⁻¹⁰ N
Express the mathematical formula to calculate the number of images formed when two mirrors are inclined at θ angle.
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Answer:
The number of images formed by two adjacent plane mirrors depends on the angle between the mirror. If (in degrees) is angle between the plane mirrors then number of images are given by, n = 360 θ − 1.
Please help!! 20 points!!
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Answer:
4
Explanation:
The cart travels the track again and now experiences a constant tangential acceleration from point A to point C. The speeds of the cart are 14.0 ft/s at point A and 19.0 ft/s at point C. The cart takes 3.50 s to go from point A to point C, and the cart takes 1.40 s to go from point B to point C. What is the cart's speed at point B
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Answer:
[tex]v_b[/tex] = 17.98 m / s
Explanation:
To solve this exercise we will use the kinematics relations in one dimension, let's start by looking for the acceleration between points A and C
v = v₀ + a t
a = [tex]\frac{v - v_o}{t}[/tex]
a = [tex]\frac{19 - 14}{3.50}[/tex]
a = 1.43 m / s²
this acceleration is uniform throughout the path.
Let's find the velocity at point B
[tex]v_c = v_b + a t[/tex]
[tex]v_b = v_c - a t[/tex]
let's calculate
[tex]v_b[/tex] = 19 - 1.43 1.40
[tex]v_b[/tex] = 17.98 m / s
Energy conversion means saving energy.
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Answer:
yeah
Explanation:
That is correct!
very good!
compare the maximum rate of heat transfer to the basal metabolic rate by converting a BMR of 88 Kcal/hr into watts. What is the value
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Answer:
The Basal Metabolic Rate of 88 kilocalories per hour is equal to 102.276 watts.
Explanation:
A watt is equal to 1 joule per second, a kilocalory equals 4184 joules and a hour equals 3600 seconds. We convert the Basal Metabolic Rate (BMR) from kilocalories per hour into watts by following conversion:
[tex]x = 88\,\frac{kcal}{hr}\times \frac{4184\,J}{1\,kcal}\times \frac{1\,h}{3600\,s}[/tex]
[tex]x = 102.276\,W[/tex]
The Basal Metabolic Rate of 88 kilocalories per hour is equal to 102.276 watts.
A Force has a size and a(n)?
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Answer:
Force have both magnitude and direction since its considered to be a scalar quantity
Explanation:
____________
The two most common isotopes of tin have atomic masses of 118 and 120.
How do atoms of these two isotopes differ?
A. One of them has two fewer electrons than the other.
B. The heavier isotope has two more protons than the lighter isotope.
C. The lighter isotope has two more neutrons than the heavier
isotope.
D. The heavier isotope has two more neutrons than the lighter
isotope.
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Answer:
It's D!
Explanation:
The two most common isotopes of tin have atomic masses of 118 and 120 and have the key difference that the heavier isotope has 2 more neutrons than the lighter one.
What is Tin?Tin is the element that has the largest number of stable isotopes, only out of the ten are potentially radioactive but have not been observed to decay.
What is the difference between Tin118 and Tin120?
We know that Tin 118 and Tin 120 are the isotopes of the tin, but the key difference between them is that the Tin 120 has two more neutrons than Tin118, therefore, the isotopic mass of the two is different as well.
Mass of Tin118 < Mass of Tin120
Therefore, from all the provided options the correct option is that the heavier isotope has two more neutrons than the lighter isotope.
Hence, the correct option is d.
Learn more about Isotopes:
https://brainly.com/question/13214440
