Work And Energy
When a body falls freely towards the earth, then its total energy
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A uniform chain has mass Mand length L. It is lying on a smooth horizontal table with half of its length hanging vertically downward. The work done in pulling the chain up the table is:
A particle of mass 20 g is thrown vertically upwards with a speed of 10 m/s. Find the work done by the force of gravity during the time the particle goes up.
A block of mass m is suspened through a spring of spring constant k and is in equlibrium. A sharp blow gives the block an initial downward velocity v. How far below the equilibrium psitin, the block comes to an instantaneous rest?
A person holds a bundle of hay over his head for 30 minutes and gets tired. Has he done some work or not? Justify your answer.
The potential energy of a freely falling object decreases progressively. Does this violate the law of conservation of energy? Why?
A certain household has consumed 250 units of energy during a month. How much energy is this in Joules?
Can there be displacement of an object in the absence of any force acting on it? Think. Discuss this question with your friends and teacher.
A pendulum bob has a speed 3m/s while passing thorugh its lowest position. What is its speed when it makes an angle of 600 with the vertical? The length of the pendulum is 0.5m Take g=10s2m.