Home
Class 12
PHYSICS
A block of mass 2 kg is hanging over a s...

A block of mass 2 kg is hanging over a smooth and light pulley through a light string. The other end of the string is pulled by a constant force F = 40N. The kinetic energy of the particle increases 40 J in a given interval of time. Then `(g = 10 m//s^2)`:

A

tension in the string is 40 N

B

displacement of the block in the given internal of time is 2 m

C

work done by gravity is -20J

D

work done by tension is 80 J

Text Solution

Verified by Experts

The correct Answer is:
A, B, D
`W_("net")=DeltaKE`
`(40-20)S=40 rArr S= 2m`
Work done by gravity `=(-20)xx2=-40 J`
Work done by tension `=40xx2=80 J`
`:.` (A, B, D)
Promotional Banner

Similar Questions

Explore conceptually related problems

A block of mass M is hanging over a smooth and light pulley through a light string. The other end of the string is pulled by a constant force F. The kinetic energy of the block increases by 20J in 1s.

A block of mass 10 kg is hanging over a smooth and light pulley through a light string and the other end of the string is pulled down by a constant force F. The kinetic energy of the block increases by 20 J in 1 s

A block of mass M hanging over a smooth and light pulley through a light string. The other end of the string is pulled by a constant force F. The kinetic of the block increases by 40J in 1s . State whether the following statements are true or false. (a) The tension in the string is Mg . (b) The work done the tension on the block is 40J . (c) the tension in the string is F . (d) The work done by the force of gravity is 40J in the above 1s .

A block of mass 2kg is hanging over a smooth and light pulley through a light string. The other end of the string is pulled by a constant force F=40N . At t=0 the system is at rest as shown. Then in the time interval from t=0 to t=(2)/(sqrt(10)) seconds, pick up the correct statement (s): (g=10m//s^(2))

In the system shown in the figure, the block is pulled by applying a force of 40 N on the other end of the string. If the kinetic energy of the block increases by 40 J in a given interval of time then work done by tension on the block is (g = 10 ms^(-2))

In the shown mass pulley system, pulleys and string are massless. The one end of the string is pulleed by the force F=2mg . The acceleration of the block will be

In the shown mass pulley system, pulleys and string are massless. The one end of the string is pulleed by the force F=2mg . The acceleration of the block will be

Two blocks of equal mass m are tied to each other through light string. One of the blocks is pulled along the line joining them with a constant force F. Find the tension in the string joining the blocks.

A 1 m long rope, having a mass of 40 g , is fixed at one end and is tied to a light string at the other end. The tension in the string in 400 N . Find the wavelength in second overtone (in cm ).

A bob is hanging over a pulley inside a car through a string. The second end of the string is in the hands of a person standing in the car. The car is moving with constant acceleration a directed horizontally as shown in fig. The other end of the string is pulled with constant acceleration a vertically. The tension in the string is equal to