Answer:True
Explanation:
Braking studies have shown that a tractor-trailer traveling at 55 mph needs ____ the distance to stop as an automobile.
Braking studies have shown that a tractor-trailer traveling at 55 mph needs two times the distance to stop as an automobile.
There are four parts that make up a vehicle's overall stopping distance i.e., Vehicle reaction time and distance, human perception time and distance, human reaction time and distance Vehicle Braking Distance and Time
The maximum distance your car will travel while braking under perfect circumstances. It may require 216 feet at 55 mph on dry pavement with decent brakes. The brakes must use more force to stop a bigger car, which increases heat absorption. On the other hand, large vehicles' brakes, tires, springs, and shock absorbers are made to function optimally when fully loaded. Trucks that are empty need longer stopping distances because they have less traction. It can lock up and bounce, providing substantially worse braking.
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What was the longitude problem?
The longitude problem is that the longitude shifts one degree every four minutes, especially at sea. So, it was considered a problem for sailors for centuries.
To solve the Longitude problem, Harrison planned to design a portable clock that would keep the time in three seconds a day. This would make it far more accurate than the best watches of the time. John Harrison arrives in London, seeking the support and imbalance promised by the Longitude Act of 1714.
Harrison proudly brought it to London in 1735. It was installed in Graham's workshop, to be shown to the London scientific community. Finally, a timekeeper with which to determine longitude at sea. Due to the two interconnected swinging balances of the clock, it is unaffected by the motion of the ship and is essentially a portable version of the Harrison precision wooden clock.
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When rocks fall from a cliff or outcrop and form a pile of broken rocks at the base of the cliff, this pile is called a
Yes. The pile of broken rocks at the base of a cliff or outcrop that has been formed by rocks falling from the cliff is known as a talus slope or talus pile.
Talus slopes are formed as a result of:
erosionweatheringgravitycan be found in many different geological settings.Talus slopes can be dangerous, as they are unstable and can collapse without warning.
This highlights the importance of being aware of the risks of talus slopes and taking appropriate safety precautions when near them. Additionally, the formation of talus slopes is an example of the natural processes that shape the Earth, and can help us better understand the geology of a particular area.
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consider ch4 and cf4. electronegativities: c = 2.5, h = 2.1, f = 4.0. which statement is false? A.Both molecules are nonpolar. B. The C-F bonds are more polar than the C-H bonds. OB. O C.Both are sp3 hybridized at carbon. D.The bond dipoles in CF4 and CH4 are directed toward the carbon atom E. There are no false statements. All of these statements are correct.
The false statement is D. The bond dipoles in CF₄ and CH₄ are directed toward the carbon atom. Because in CF₄, the bond dipole directed toward the Fluorine.
What is bond dipole?A bond dipole is the partial charge assigned to bonded atoms because of the differences in electron density which caused by electronegativity, inductive effects, and other factors. It is indicated with δ+ and δ- and/or the arrow symbol.
Dipoles can be examined by comparing the electronegativity of the bonded atoms. Arrows are used to show dipoles; arrows point towards the more electronegative atom. A dipole moment happens when there is an overall uneven distribution of electrons across a molecule.
Considering CH₄ and CF₄, which the electronegativities C = 2.5, H = 2.1, F = 4.0, due to the absence of any dipole moments, both molecules are non-polar. C-F bonds are more polar than C-H bonds. In CF₄, bond dipole directed toward Fluorine and in CH₄, bond dipole directed toward Carbon atom.
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power delivered to a dc circuit is the measure of the amount of ? the circuit per unit of time.
Power delivered to a dc circuit is the measure of the amount of energy delivered to the circuit per unit of time.
If the mass of ball b triples, its new momentum is kg • .
Momentum of an object is linked to its mass, m and velocity, v. The product of mass and velocity of an object is termed as its momentum. If any of these group (mass or velocity or both) changes, object's momentum will change.
In the given problem, the mass triples, i.e., new mass is 3m. Nothing is raised about its velocity (except that it increases). Let to assume that if it also triples, i.e., new velocity is 3v.
Hence, the new momentum of the body is given by 3m x 3v = 9 mv. That is the momentum changes by a factor of 9, the final momentum is 9 times the real momentum. Likewise, any other change in mass or velocity or both can be used to determine the change in momentum.
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A 2.0 kg object traveling to the right at 6.0 m/s collides head on with a
second 4.0 kg object traveling left at 6.0 m/s. After the collision, the 4.0 kg
object is traveling right at 2.0 m/s. What is the speed of the 2.0 kg object?
Elastic or inelastic?
This is an inelastic collision because some kinetic energy is lost during the collision.
In order to determine the speed of the 2.0 kg object after the collision, we need to use the conservation of momentum.
The total momentum before the collision is (2.0 kg)(6.0 m/s) + (4.0 kg)(-6.0 m/s) = -12.0 kg*m/s.
The total momentum after the collision is (2.0 kg)(v) + (4.0 kg)(2.0 m/s) = 0, where v is the speed of the 2.0 kg object after the collision.
Solving for v, we find that v = 3.0 m/s. Therefore, the speed of the 2.0 kg object after the collision is 3.0 m/s.
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When people sleep, their metabolic rate is about 2.6×10−4C/(s⋅kg). How many Calories does a 80 −kg person metabolize while getting a good night's sleep of 8.5 hr ?
Answer:
7.93 calories
Explanation:
To find the total number of calories burned by an 80 kg person during a good night's sleep of 8.5 hours, you can use the formula:
calories burned = metabolic rate * weight * time
In this formula, the metabolic rate is given as 2.6 x 10^-4 calories per second, the weight is given as 80 kg, and the time is given as 8.5 hours. To use this formula, you first need to convert the metabolic rate to calories per hour and the time to seconds. There are 3600 seconds in an hour, so you can multiply the metabolic rate of 2.6 x 10^-4 calories per second by 3600 to get the number of calories per hour. This gives you a metabolic rate of 0.936 calories per hour. You can then multiply this value by the weight of 80 kg and the time of 8.5 hours to get the total number of calories burned. This gives you a total of 7.93 calories burned during a good night's sleep.
If the object is located far (many focal lengths) from the lens, the image will appear at a. the focal point b. the negative focal point c. no image will form
The picture will appear at the focal point if the object is far away from the lens (several focal lengths). The right response is option A. How strongly is determined by the focal length of an optical system.
The system either converges or diverges light; this is the opposite of the optical power of the system. A system's light converges when the focal length is positive, while it diverges when the focal length is negative. optical system is a more recent secondary storage medium than magnetic memory. It has shown to be a promising random medium for high-capacity secondary storage since it can fit a lot of text and data into a small amount of space. A rotating disc is the main component of an optical-disk storage system.
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8. A 1580 kg car is traveling with a speed of 150 m/s. What is the magnitude of the horizontal net force that is required to bring the car to a halt in a distance of 50.0 m
The amount of horizontal net force needed to stop the car at a distance of 50.0 m is equal to F = 3555 N.
Describe a force.When a thing with mass is pushed or pulled, it changes its velocity, according to the definition of force in physics. An external force is an agent that has the power to alter the resting or moving condition of a body. It has a direction and a magnitude. The newton, abbreviated N, seems to be the Standard unit of force.
What is the secret of using force?Newton's second principle of motion provides the definition of the force formula: An object's force corresponds to its mass x its acceleration. F = m ⨉ a.
u = 15 m/s
v= 0
s = 50m
v2 = u2 +2as
= 15*15 + 2*50*a
225 + 100a
a = 2.25m/s2
F = ma
F= 1580 * 2.25
F = 3555 N.
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3. Which property of electromagnetie waves must go down as the frequency goes up?
Answer:
Explanation:The number of complete wavelengths in a given unit of time is called frequency (f). As a wavelength increases in size, its frequency and energy (E) decrease. From these equations you may realize that as the frequency increases, the wavelength gets shorter. As the frequency decreases, the wavelength gets longer.
True or false: The quantity represented by ω0 is a function of time (i.e., is not constant).
True or false: The quantity represented by ω is a function of time (i.e., is not constant
Which of the following equations is not an explicit function of time t, that is, does not involve t as a variable, and is therefore useful when you do not know or do not need the time? θ=θ0+ω0t+(1/2)αt2
ω=ω0+αt
ω2=ω02+2α(θ−θ0)
In the equation ω=ω0+αt, what does the time variable t represent? Choose the answer that is always true. Several of the statements may be true in a particular problem, but only one is always true. Choose the answer that is always true. Several of the statements may be true in a particular problem, but only one is always true.
the moment in time at which the angular velocity equals ω0
the moment in time at which the angular velocity equals ω
the time elapsed from when the angular velocity equals ω0 until the angular velocity equals ω
Suppose you are asked to find the amount of time t, in seconds, it takes for the turntable to reach its final rotational speed. Which of the following equations could you use to directly solve for the numerical value of t? Suppose you are asked to find the amount of time , in seconds, it takes for the turntable to reach its final rotational speed. Which of the following equations could you use to directly solve for the numerical value of ?
θ=θ0+ω0t+(1/2)αt2
ω=ω0+αt
ω2=ω02+2α(θ−θ0)
More information is needed before t can be found.
In the world around us, rotational motion with a constant nonzero acceleration is rather prevalent. For instance, several devices have rotating components. false when the machine is switched on or off.
What direction does the vector that represents the angular velocity point in?
When an item rotates clockwise, the direction of the angular velocity points away from you; when it rotates counterclockwise, it points toward you. This is described by the right-hand rule in mathematics.
How is angular velocity determined?
The angular velocity (w), a vector quantity in uniform circular motion, is determined by dividing the angular displacement (), also a vector quantity, by the change in time (t). The speed is calculated by dividing the arc length (S) by.
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Two packages are connected by a very light string that goes over an ideal pulley as shown in the figure. Package A has a mass of 3.0 kg and can slide along a rough plane inclined at 30° above the horizontal. The string acts on package A parallel to the surface of the plane. The coefficient of static friction between package A and the plane is 0.40. What minimum mass should package B have in order to start package A sliding up the ramp?
To find the minimum mass of package B that is needed to start package A sliding up the ramp, we can use the force of friction. The force of friction is given by:
Friction = friction coefficient * normal force
The normal force is the force perpendicular to the surface of the ramp and is equal to the weight of package A (3.0 kg * 9.8 m/s^2) times the cosine of the angle of the ramp (cos 30° = 0.866). So:
friction = 0.40 * (3.0 kg * 9.8 m/s^2 * 0.866)
friction = 10.5 N
The force needed to start package A sliding up the ramp is equal to the force of friction. To provide this force, package B needs to weigh at least:
mass of package B = force / (g)
mass of package B = 10.5 N / 9.8 m/s^2
The mass of package B = 1.07 kg
Therefore, package B must have a minimum mass of 1.07 kg to start package A sliding up the ramp.
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From the top of a tower, a ball is thrown vertically upwards. When the ball reaches h below the tower, its
speed is double of what it was at height h above the tower. Find the greatest height attained by the ball from
the tower.
It’s a Kinematics 1d question
A ball is thrown vertically upwards. The ball's speed then reaches double of what it was at height h above the tower when it reaches h below the tower. The ball can jump from the tower up to a height of 3h.
What does physics kinematics mean?The study of motion in a system of bodies is called kinematics, which does not directly take into account the forces or potential fields influencing the motion. In other terms, kinematics investigates how momentum and energy are distributed among interacting bodies.
What does kinematics serve as a tool for?The goal of kinematics is to provide a description of the spatial positions of bodies or systems of material particles, as well as the speeds and velocities of those particles (acceleration).
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what is the work done by a constant force in accelerating a 2kg block from rest to 15 m/s in a distance of 100m
Answer:
2000
Explanation:
workdone=F×D
mg×h
u=0
d=100
a=15
m=2
=2×10×100
=2000
How much power is generated by a force of 49.2 N pulling a box at a velocity of 11.88 m/s?
Power is generated by a force of 49.2N pulling a box at a velocity of 11.88m/s is equal to 584.5 W.
What is power?The power can be described as the rate of doing work and is equal to the work done per unit of time. The SI unit of measurement of the power joules per second (J/s) or Watt (W).
Power can be defined as a time-based quantity and the rate at which work is done upon a body. The mathematical formula for power can be expressed as shown below.
Power = Work/time
P = W/t
The Power can also be represented as P = F.v
Given, the force applied on the box, F = 49.2 N
The velocity of the box after applying force, v = 11.88 m/s
The power generated by force, P = F.v
P = 49.2 × 11.88
P = 584.5 W
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When a comet comes close to the Sun, its volatile ice sublimates and transforms directly from the solid to ________ phase.
When a comet comes near the Sun, its volatile ice sublimates and changes directly from the solid to the gas phase.
Comets are cosmic snowballs of frozen gases, dust, and rocks, orbiting the Sun. When frozen, comets are the size of a small town. As the comet's orbit approaches the Sun, it heats up, spewing gases and dust onto its giant glowing head, larger than most planets.
Comets vaporize when their orbits come to close to the Sun. Comets do not melt in the strict sense of chinging to liquid. However, since they are made up partly of ice and other volatile compounds, comets vaporize (turn directly to gas) when warmed in the vacuum of space by orbiting near the sun.
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If sunlight were green instead of white, the most comfortable color to wear on a hot day would be a. blue b. green c. black d. white
If sunlight were green, then green would be the most comfortable color to wear on a hot day. This is option b.
We know that sunlight is white because our Sun is white. Some objects will reflect most of the colors in the sunlight, which would make them appear white or pale. Some will absorb most of the colors and this would make them appear black or dark. On a hot day, white clothes reflect sunlight the most so they will be more comfortable to wear.
A red rose, for instance, is red because it reflects red color and absorbs the remaining colors.
Imagine that sunlight were green instead of white. A green object would reflect most colors while a red (the opposite color of green) object would instead absorb most colors in the sunlight. Therefore, the most comfortable color to wear on a hot day would be green if sunlight were green.
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If an object only absorbs blue light how would it appear in white light?
An object is illuminated by red, green, and blue light if it is illuminated by white light. Only red and green light will be reflected from an item if it absorbs blue light.
In white light, how does the blue item appear?White light causes an object to seem blue because it reflects only blue light and absorbs all other colors. Since there is no color to reflect when that object is placed in red light, it absorbs all of the red light that strikes it and appears black.
Why does white light make a blue shirt look blue?We mostly notice colors in reflected light. The room's variously colored objects reflect some of the white light while absorbing the rest. A blue shirt shows that white light contains blue light because blue wavelengths are reflected by blue and are absorbed by blue.
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Look at the diagram below. This type of power station is called a
word completes the sentence?
Answer:
hydroelectric
Explanation:
What is the speed of the block/bullet system after the collision? express your answer in terms of vi , mw , and mb.
The speed of the block/bullet system after the collision is:
v = (m₁v₁) + (m₂v₂) / (m₁ + m₂)
When two (or sometimes more) things hit in an inelastic collision, they stick together. The two-object system is an isolated system because we often ignore any external factors acting on the interacting components. This makes sense in practice if we look at the objects right before and right after the impact, before friction, gravity, etc., have a chance to exert any substantial impulses on our system.
The Law of Conservation of Momentum is typically used to handle inelastic collisions in one dimension. After all, a system's entire momentum will be conserved if no outside forces are acting on it.
Because momentum must be conserved,
P after = P before
So,
(m₁ + m₂)v = m₁v₁ + m₂v₂
Calculating v (velocity/speed) results in:
v = (m₁v₁) + (m₂v₂) / (m₁ + m₂)
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A student rolls a marble on two different surfaces with the same force. The table shows the distance travelled in each trial.
Why does the marble travel a greater distance on glossy paper but not on sandpaper?
a) Because the mass of the marble on sandpaper is high.
b) Because the mass of the marble on glossy paper is high.
c) Because interlocking between the surface of marble and sandpaper is high.
d) Because interlocking between the surface of marble and glossy paper is high.
Answer:
Option C, because interlocking between the surface of the marble and sandpaper is high.
Explanation:
The distance an object travels relies on the force, mass, and friction imposed on the thing. Since the force and mass is constant, friction is the only variable that changes.
Rougher surfaces, such as sandpaper, have little bumps and grooves that increase the amount of kinetic (motion-related) friction an object can have, thus decreasing the distance as the more significant the friction, the more force an object needs to move the same distance.
Since mass is constant, A and B are eliminated. Glossy paper has a smooth surface, so interlocking is minimal; therefore, Option D can also be eliminated.
That leaves Option C.
Help me in the question 4 plsss
Answer: gamma, ultraviolet, infrared, microwaves
Explanation:
It is based on shortest to longest wavelength and gamma has the shortest wavelength but the highest amount of energy.
If the maximum tractive effort of a vehicle is 450 lb and the engine generated tractive effort is 425 lb, then the available tractive effort is
If the maximum tractive effort of a vehicle is 450 lb and the engine generated tractive effort is 425 lb, then the available tractive effort is 450 lb.
The maximum tractive effort of a vehicle is the maximum amount of force that the vehicle can apply to the ground to generate traction and move forward. The engine generated tractive effort is the amount of force that the vehicle's engine can produce to move the vehicle. The available tractive effort is the amount of force that the vehicle can actually use to move forward, and it is determined by the maximum tractive effort of the vehicle. In this case, the available tractive effort is 450 lb, which is the maximum tractive effort of the vehicle.
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A nuclear power plant had a massive spill. Before cleanup begins, it must first be inspected by professionals who can determine dangers posed by the spill. The professionals who are best equipped for inspecting the facility would have careers in
environmental services.
plant systems.
animal systems.
power, structural, and technical services.
Answer:
The professionals who are best equipped for inspecting a nuclear power plant after a spill would likely have careers in power, structural, and technical services, as well as environmental services. These professionals would have the necessary expertise to assess the damage to the facility and identify any potential hazards posed by the spill. They may also be able to recommend appropriate cleanup measures and work with local authorities to ensure that the facility is safe for workers and the public.
Explanation:
A 1.5 kg object falls from a height of 2.0 m onto a spring scale with a spring constant of 1.5x105 N/m. What is the reading on the scale at its greatest compression?
The reading on the scale at its greatest compression is 3,000 N.
What is the reading of the scale?
The reading of the scale at the greatest compression is determined by applying the principle of conservation of energy.
The greatest compression of the scale occurs when the potential energy of the object at the given height falls on the scale.
Mathematically, the formula for potential energy of an object is given as;
P.E = mgh
where;
m is the mass of the objectg is acceleration due to gravityh is the height of fall of the objectP.E = ( 1.5 kg x 9.8 x 2 )
P.E = 29.4 J
P.E = ¹/₂kx²
where;
x is the compression of the springk is the spring constantx² = 2P.E / k
x = √ ( 2P.E / k )
x = √ ( 2 x 29.4 / 150000 )
x = 0.02 m
The reading of the scale is calculated as follows;
F = kx
F = 150,000 x 0.02
F = 3,000 N
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When a light ray moves from air into glass, which has a higher index of refraction, its path is A) bent toward the normal. B) parallel to the normal. C) bent away from the normal. D) do not bent.
The correct answer is A) bent toward the normal. When a light ray moves from air into glass, which has a higher index of refraction, its path will be bent toward the normal. This is due to the fact that light travels more slowly in glass than in air and thus is bent at the interface between the two materials.
When a light ray passes from one medium to another, it can be refracted, or bent. This is due to the fact that the speed of light varies depending on the medium it is travelling through. When a light ray moves from a medium with a lower index of refraction, such as air, to a medium with a higher index of refraction, such as glass, its path will be bent toward the normal. This phenomenon is known as refraction, and it is an important part of optics and optical systems.
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the region enclosed by both of the cardioid r=1+cos(theta) and r=1-cos(theta)
The equation of the cardioid is r = a(1 + cos(θ)), where a is the distance of the center of the cardioid from the origin.
In this case, the two equations given are r = 1 + cos(θ) and r = 1 - cos(θ), which are the equations of two cardioids with the same center at the origin.
The first equation, r = 1 + cos(θ), represents the outer cardioid, and the second equation, r = 1 - cos(θ), represents the inner cardioid. The region enclosed by these two cardioids is the area between the two curves, which is the space between the outer and inner cardioids.
This region is symmetric about the x-axis, as the equations are symmetric about the x-axis. The region is infinite as the equations are defined for all real values of θ.
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3. During a circus performance, a 72 kg human cannonball is shot out of an 18 m long cannon. a. Of the human cannonball spends 0.95 s in the cannon, determine the average net force on him in the barrel of the cannon. b. What will the velocity of the human cannonball be at it leaves the cannon
The human cannonball will depart the cannon at a velocity of 2872.8 N.
These details are what we know:
M = n72 kg, Y = 18 m, and T = 0.95 s.
From this point, the acceleration is calculated using the equation y=1/2at2.
A = (2 x 18m)/(0.95s2) = 36/0.9025 = 39.9m/s2.
We then apply the formula F = ma F=(72kg) x (39.9) = 2872.8N.
The average net force acting on him while he is inside the cannon's barrel is 2872.8N.
What does velocity vs. speed mean?Velocity, as opposed to speed, refers to the pace and direction of an object's movement as it moves down a path. In other words, whereas velocity is a vector, speed is a scalar quantity.
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A bullet of mass 0.00163 kg and speed v passes completely through a pendulum bob of mass 95 kg. The bullet emerges with a speed v/2. The pendulum bob is suspended by a stiff rod of length 0.777 m and negligible mass. The acceleration of gravity is 9.8 m/s 2 . v v/2 M l What is the minimum value of v such that the pendulum bob will barely swing through a complete vertical circle
The minimum value of v such that the pendulum bob will barely swing through a complete vertical circle is 6.2 x 10^5m/s.
Given the mass of bullet (m) = 0.00163kg
Initial speed of bullet = v
mass of pendulum (m2) = 95kg
Initial velocity of pendulum bob = 0m/s
Let final velocity of bob = v1
Final speed of bullet after passing through pendulum = v/2
length of rod of pendulum (L) = 0.777m
acceleration of gravity (g) = 9.8m/s^2
We know that the energy is conserved at every point of motion. So final velocity of pendulum bob is 0m/s as will barely swing through a complete vertical circle.
Therefore Kinetic Energy (KE) = Potential Energy (PE)
0 + 1/2m2v1^2 = m2gh where h is height of pendulum = 2L in a full circle
1/2 x 95 x v1^2 = 95 x 9.8 x 2 x 0.777
v1 = 2 x √7.6146 = 2 x 2.7 = 5.4m/s
Applying conservation of momentum for bob and bullet, we get
Pi = Pf such that m1v + 0 = m1v/2 + m2v1
m1v/2 = m2v1
v = m2 x v1 x 2 / m1 = 95 x 5.4 x 2/0.00163 = 6.2 x 10^5m/s
Hence the minimum value of v such that the pendulum bob will barely swing through a complete vertical circle is 6.2 x 10^5m/s
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The speed of the pendulum bob must be at least 6.2 x 105 m/s in order for it to barely complete a vertical circle.
What is the pendulum's bob's speed as it passes through its lowest point?Gravity transforms the potential energy of the pendulum as it swings downhill into kinetic energy, leaving the pendulum bob with only its kinetic energy at the bottom of the swing.
Considering that a bullet weighs (m) 0.00163 kg
Initial bullet velocity = 95 kg pendulum mass (m2)
Bob's initial speed is 0 meters per second.
Let bob's final speed be equal to v1.
Final speed of the bullet after passing through the pendulum is equal to v/2 length of the pendulum rod (L) is equal to 0.777m acceleration of gravity (g) is equal to 9.8m/s2.
We are aware that energy is stored.Therefore, Kinetic Energy (KE) = Potential Energy (PE) 0 + 1/2m2v12 = m2gh, where h is the height of the pendulum, which is equal to 2L in a full circle.
By using the conservation of momentum for the bob and the bullet, we arrive to the equation Pi = Pf, where m1v + 0 = m1v/2 + m2v1 m1v/2 = m2v1 v = m2 x v1 x 2 / m1 = 95 x 5.4 x 2/0.00163 = 6.2 x 105m/s.
Therefore, 6.2 x 105 m/s is the lowest value of v at which the pendulum bob will just about complete a vertical circle.
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