Physicshard · Past Paper
A block of mass M is pulled along a horizontal frictionless surface by a rope of mass m. A force F is applied at one end of the rope. The work done by the rope on the block is:
AFs
B[M/(M+m)]Fs
C[m/(M+m)]Fs
DZero
✓ Correct Answer: B — [M/(M+m)]Fs
Acceleration a = F/(M+m). Tension on block = Ma = MF/(M+m). Work = Tension * s = [MF/(M+m)]s.
Share this question
More from Physics
- The center of gravity of a uniform ring lies:
- Chromatic aberration in a lens is caused by:
- If a car travels 100km at 40km/h and the next 100km at 60km/h, the average speed is:
- A motor of 100 W works for 1 minute. How much work does it do?
- Which of the following is used to see objects hidden around corners?