Work, Power and EnergyHard
Question
One end of a light rope is tied directly to the calling. A man of mass M initially at rest ground starts climbing the rope hand over hand up to a height l.From the time he starts at rest on the ground to the time he is hanging at rest at a height l, how much work much work was on the man by the rope
Options
A.0
B.Mgl
C.- Mgl
D.It depends on how fast the man goes up.
Solution
Total work done on man = 0 ⇒ Work done by string = - 0 work done by gravity = - (- Mgl) = Mgl
Create a free account to view solution
View Solution FreeMore Work, Power and Energy Questions
A force acts N on a body and produced a displacement m. The work done will be...A mass of M kg is suspended by a weightless string. The horizontal force that is required to displace it until the strin...A man of mass m standing at the bottom of the staircase of height L climbs it and stands at its top...A ball is dropped from a height of 10m. If 40% of its energy is lost on collision with the earth then after collision th...A metal surface is illuminated by light of two different wavelengths 248 nm and 310 nm. The maximum speeds of the photoe...