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## Solved Once you have pulled hard enough to start the box

Answer to Solved Once you have pulled hard enough to start the box

**Question:** Once you have pulled hard enough to start the box moving upward, what is the magnitude F of the upward force you must apply to the rope to start raising the box with constant velocity? Express the magnitude of the force in terms of m, the mass of the box. Consider lifting a box of mass m to a height h using two different methods: lifting the box directly

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100% (135 ratings) Transcribed image text: Once you have pulled hard enough to start the box moving upward, what is the magnitude F of the upward force you must apply to the rope to start raising the box with constant velocity? Express the magnitude of the force in terms of m, the mass of the box. Consider lifting a box of mass m to a height h using two different methods: lifting the box directly or lifting the box using a pulley (as in the previous part). What is W_d/W_p, the ratio of the work done lifting the box directly to the work done lifting the box with a pulley? Express the ratio numerically. W_d/W_p =

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## Once you have pulled hard enough to start the box moving upward, what is the magnitude F of the

Once you have pulled hard enough to start the box moving upward, what is the magnitude F of the upward force y… Get the answers you need, now!

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Answer:

F = mg/2

Explanation:

The full question is attached to the solution of this question.

The forces acting on the box include the weight of the box, the force, F and the tension in the wire attached.

The force required to pull up the box at constant velocity normally is equal to the weight of the box.

W = mg

But in this setup,

The force balance on the box

Sum of upward forces = sum of downward forces.

T + F = mg

But the pulley is frictionless, hence, the force, F is equal to the tension in the wire.

T = F

2F = mg

F = mg/2

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