A car drives at a constant speed along a completely level race track. At which point is the acceleration the greatest?
answer
-The point at the smallest/sharpest curve
-The smallest curve gives the largest acceleration
question
What is more work, carrying a heavy box straight up a ladder, or carrying the same box up the stairs the same height?
answer
-They are both the same amount of work
-If the work is done without friction the amount of work depends on the height
question
At which point along a frictionless rollercoaster track does the rollercoaster have the greatest speed?
answer
-The lowest point on the rollercoaster has the greatest kinetic energy
-Lowest point has greatest speed
question
A spring gun with a very stiff spring is compressed a distance d and fired straight up where it ultimately reaches a height of H. How high will the projectile go if the spring is compressed a distance of 2d?
answer
-4H
-2∆x²=4∆x
question
A simple harmonic oscillator is hit with a hammer from its resting states and it starts oscillating with a given amplitude and frequency. What would happen if it was struck again from its resting state. but this time struck harder.
answer
-Amplitude would increase, frequency would stay the same
-Fsp=-K(x-xeq)
-amplitude would change but frequency would not
question
A simple harmonic oscillator is set up so that some its mass can be dropped at any time with the push of a button. If the oscillator is set in motion with a given amplitude, what happens to the amplitude of the oscillations when the button is pushed.
answer
-Not enough information
-Conservation of energy, depends on speed when let go, don't know when its dropped, don't know speed.
question
A ping pong ball collides elastically with a bowling ball. Which of them experience the greater change in momentum?
answer
-Both have the same ∆p.
-Momentum is conserved
question
One car slides frictionlessly on ice then collides and sticks to a second stationary car. Which sentence best describes the behavior of the center of mass of the system?
answer
The center of mass of the two cars moves forward at the same constant speed both before and after the collision.
question
A long uniform board is hung by a nail through its en d and allowed to swing freely around the nail. At which position would the torque due to gravity around the nail be the greatest.
answer
Horizontal out
question
A mass M is hung from a wire of an unstretched length l, under the load the wire stretches a small amount. IF the same mass were attached to wires next to each other, by how much would that stretch.
answer
1/2∆l
question
Beginning the instant the object is released, select the graph that best matches the position vs. time graph for the object.
answer
H
question
Beginning the instant the object is released, select the graph that best matches the velocity vs. time graph for the object.
answer
E
question
Beginning the instant the object is released, select the graph that best matches the acceleration vs. time graph for the object.
answer
F
question
Which moment corresponds to the maximum potential energy of the system?
answer
A
question
Which moment corresponds to the minimum kinetic energy of the system?
answer
A
question
Consider the block in the process of oscillating.
answer
Moving toward equilibrium.
question
Which moment corresponds to the maximum kinetic energy of the system?
answer
C
question
Which moment corresponds to the minimum potential energy of the system?
answer
C
question
At which moment is K=U?
answer
D
question
The two toy cars shown in the figure, with masses as given, are ready to race. Both cars begin from rest. Which car crosses the finish line 1.0 m away first?
answer
Car B wins
question
Which car has the larger kinetic energy when it crosses the finish line 1.0 m away?
answer
Both cars have the same kinetic energy
question
Which car has a larger momentum when it crosses the finish line 1.0 m away?
answer
Car A
question
The cars' motors supply the same force to each car over the course of a 10-second race. Which car has traveled farther after 10 s?
answer
Car B
question
After 10 s which car has a larger kinetic energy?
answer
Car B
question
After 10 s which car has a larger momentum?
answer
Both cars have the same momentum.
question
A bullet of mass mb is fired horizontally with speed vi at a wooden block of mass mw resting on a frictionless table. The bullet hits the block and becomes completely embedded within it. After the bullet has come to rest within the block, the block, with the bullet in it, is traveling at speed vf. Which of the following best describes this collision?
answer
-Perfectly inelastic
question
Which of the following quantities, if any, are conserved during this collision?
answer
Momentum only
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