A body of mass moves with a velocity of along a circular path of radius . The power produced by the body will be
zero
Get Answer
The power of body is given by . as the body is moving in circular path, centripetal force and velocity are at , or power .
Johnny and his sister Jane race up a hill. Johnny weighs twice as much as jane and takes twice as long as jane to reach the top . Compared to Jane
Johnny did more work and delivered more power.
Johnny did more work and delivered the same amount of power.
Johnny did more work and delivered less power
Johnny did less work and johnny delivered less power.
The work is done against gravity so it is equal to the change in potential energy.
For a fixed height, work is proportional to weight lifted. Since Johnny weighs twice as much as Jane he works twice as hard to get up the hill.
Power is work done per unit time. For Johnny this is . Jane did half the work in half the time, which is the same power delivered by Johnny.
A constant power is applied to a car starting from rest. If is the velocity of the car at time , then
Power,
As is constant, constant
If two persons and take 2 seconds and 4 seconds respectively to lift an object to the same height , then the ratio of their powers is
94. (c) Power
Therefore power of
and power of
A 10 H.P. motor pumps out water from a well of depth and fills a water tank of volume 22380 litres at a height of 10 from the ground. The running time of the motor to fill the empty water tank is
5 minutes
10 minutes
15 minutes
20 minutes
Volume of water to raise
If a machine gun fires bullets per second each with kinetic energy , then the power of the machine gun is
Power total work done
time
A particle of mass begins to move under the action of a time dependent force where and are unit vectors along and axis. What power will be developed by the force at the time ?
Power, .
A force applied by an engine of a train of mass changes its velocity from to in 5 minutes. The power of the engine is
Power
A long iron chain of linear mass density is hanging freely from a rigid support. If , then the power required to left the chain upto the point of support in 10 second
height of iron chain
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