A curved groove is place on the top of a level table as shown in the diagram. A ball is pushed in the groove at P so that it leaves at Q. Which picture shows how the ball will move when it leaves the groove at Q?

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• 
• 
• 

At the instant shown in the diagram, the car's centripetal acceleration is directed-

• toward E

• toward N

• toward W

• clockwise

At the position shown in the diagram, which arrow indicates the direction the instantaneous (tangential) velocity of the cart?

• A

• B

• C

• D

Bruno the bat flies at a speed of 0.5 m/s in circle of radius 1 m. What is his acceleration?

• 0.25 ms^-2
• 0.5 ms^-2
• 1 ms^-2
• 2 ms^-2

A pilot experiences centripetal acceleration of 2g's while maneuvering a loop at a speed of 400 m/s.  What is the radius of the loop?

• 203 m
• 8163 m
• 80,003 m
• 23 m

The velocity is always _____ to the line of a circle. 

• outwards
• towards the center
• tangent
• faster

If the radius of the string is .3 meters long and the stopper makes 5 revolutions per second, what is the speed of the stopper? (Hint: C=2πr)

• 9.4 m/s
• 6.8 m/s
• 11.7 m/s
• 3.5 m/s

What happens to an object's speed as the radius decreases?

• It increases.
• It decreases.
• It remains unchanged.

The drum of a washing machine rotates 600 times in 1 minute. What is the frequency of the drum?

• 600 Hz

• 10 Hz

• 0.1 Hz

• 0.002 Hz

Which represents the acceleration of the ball?

• A
• B
• C
• D