Asked Jan 23, 2020

Choose the BEST answer to the following:

Lift a 100-N crate with an ideal pulley system by pulling a rope downward with 25 N of force. For every 1-m length of rope pulled down, the crate rises

(a) 25 cm.

(b) 25 m.

(c) 50 cm.

(d) None of these.


Expert Answer

Step 1

Step 1

Work done by a body is the product of force on it and the displacement produced by it.

Let F be to force acting through displacement d. Then work done is given as

Physics homework question answer, step 1, image 1
Step 2

Step 2

Weight of the crate W1 and the downwards force W2 is

Physics homework question answer, step 2, image 1
Step 3

Step 3

Now it is kn...

Physics homework question answer, step 3, image 1

Want to see the full answer?

See Solution

Check out a sample Q&A here.

Want to see this answer and more?

Solutions are written by subject experts who are available 24/7. Questions are typically answered within 1 hour.*

See Solution
*Response times may vary by subject and question.
Tagged in



Work,Power and Energy

Related Physics Q&A

Find answers to questions asked by student like you
Show more Q&A

Q: Can anybody tell me about the ending 0 in these numbers, why we include it in determiining "sig figs...

A: In 0.0210, the number of significant digits is 2. Because of the zero on the right side of the numbe...


Q: Two waves are traveling in opposite directions on the same string. The displacements caused by the i...

A: The displacements and the phase angles caused by individual waves are given as,


Q: 5. Mick is a 185 lb snowboarder. His snowboard weighs 67 N. What is the combined weight of Mick and ...

A: Given that mass of Mick is 185lb, and the weight of the snowboard is 67N.The combined weight of the ...


Q: You are lowering two boxes, one on top of the other, down the ramp shown in the figure (Figure 1) by...

A: here the acceleration is zero,the angle of elevation is,  


Q: Why is sawdust a poorer conductor than wood from which it is made?

A: Step 1Sawdust is the powdered form of wood.


Q: Water flows at a speed of 6cm/s through a tube of radius 1cm. Coefficient of viscosity of water at r...

A: Given :speed of water = 6cm=6x10-2m/sRadius of tube =1cm=10-2mDiameter of tube =2x10-2mcoefficient o...


Q: What are the different ways of increasing the number of molecular collisions per unit time in a gas?

A: The ways by which the number of molecular collisions in a gas can be increased are;


Q: What does tea in thermos flask (Dewar flask) remain hot for long time?

A: A thermal or Dewar flask is a storage vessel that provides insulation to its contents from the surro...


Q: Find the molar mass and the number of degrees of freedom of molecules in a gas if cV=0.65J/gK and cP...

A: Step 1It is given that