At instant t 0, you are sitting on a dock and you begin using a rope to lower a

ID: 1603392 • Letter: A

Question

At instant t0, you are sitting on a dock and you begin using a rope to lower a 4.0-kg lobster trap into the water, 1.4 m below. You lower the trap at a constant speed of 1.0 m/s. At instant t1 it just reaches the water surface 1.4 m below the dock. You slacken the rope and the trap continues to move downward at a constant speed of 1.0 m/suntil at instant t2 the trap reaches the bottom of the 10-m-deep bay. Choose a system that includes the water, Earth, and the trap.

Part A

Do you do any work on the system in the interval from t0to t2?

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Part B

What forces are exerted on the trap during the interval from t0 to t2 before the trap reaches the bottom of the bay? The forces are not necessarily exerted during the whole interval from t0 to t2.

Check all that apply.

Part A

Do you do any work on the system in the interval from t0to t2?

Do you do any work on the system in the interval from to ? No Yes

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Part B

What forces are exerted on the trap during the interval from t0 to t2 before the trap reaches the bottom of the bay? The forces are not necessarily exerted during the whole interval from t0 to t2.

Check all that apply.

Check all that apply. normal force exerted by bay floor tensile force exerted by rope gravitational force resistive force exerted by water

Explanation / Answer

PartA)...... yes....

PartB)normal force exerted by the floor....tensile force exerted by rope.....gravitational force...resistive force exerted by water

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At instant t 0, you are sitting on a dock and you begin using a rope to lower a

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