Physics Questions?

[HAWK]

Hey guys i need help on this Q.

A window cleaner sitting in a cage is supported by a rope and pulley system. The combined mass of the window cleaner and cage is 115 kg.

Calculate the magnitude of the force required to be exerted by the window cleaner on the rope in order for the cage to rise with constant velocity. Ignore friction and the mass of the pulley and rope.

[hari b]

well,
for the cage to rise with constant velocity, it means acceleration is zero. according to Newton's second law of motion, F=ma, if the acceleration is zero, then the resultant force is zero.

now, come to the point, the weight of the cage and the window cleaner acts vertically downwards, which is w=mg,
W = 115 * 9.8 = 1127 N. for the resultant force to be zero, the upward force which is exerted on the rope must be 1127 N.

[Akshay D]

i don't no