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a 2500kg wrecking ball is hanging from a cable that is 3m long. the wrecking ball is being lowered to the ground at a constant speed?

Which of the following statement is true of the forces on the wrecking ball?

a. the weight and tension force are both pointing in the same direction but the magnitudes are not related

b. the magnitude of the gravitational force on the wrecking ball is equal to the magnitude of the tension force on the ball

c. the magnitude of the gravitational force on the wrecking ball is larger than the magnitude of the tension force on the ball

d. the weight of the wrecking ball is less than the magnitude of the tension force on the ball

e. none of the above are correct

Which of the following forces are acting on the wrecking ball as it accelerates to the left? (before it hits the wall)

a. gravity and tension on the ball by the cable only

b. gravity, the tension on the ball by the cable, air resistance

c. gravity, the tension on the ball by the cable, resistance to the moition to the right, air resistance

d. gravity, the tension on the ball by the cable, force of motion to the left, resistance to motion towards the right, air resistance

e. gravity, the tension on the ball by the cable, force of motion towards the left, air resistance

f. none above are correct
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Added Fri, 07 Aug '15
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Part A)

Constant velocity means forces must be balanced, so the only one that says that is Choice B...

The magnitude of the gravitational force on the wrecking ball is equal to the magnitude of the tension force on the ball.

Part B)

Choice E contains all the forces of motion in this situation...

Gravity, the tension on the ball by the cable, force of motion towards the left, air resistance
Edit
Added Fri, 07 Aug '15
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