Home
Class 11
PHYSICS
An insect of mass m moves up along a han...

An insect of mass m moves up along a hanging stationary thread, with acceleration a. Find the power delivered by the gravity after a time t.

Text Solution

Verified by Experts

Power delivered by gravity at any instant is
`P_g=mvecg*vecv`
where v is the instantaneous velocity of the insect.
Since the insect moves with an upward acceleration a, `v=at`.
Substituting `v=at` in the above expression, we have
P_g=-mgat`
Promotional Banner

Topper's Solved these Questions

  • WORK, POWER & ENERGY

    CENGAGE PHYSICS ENGLISH|Exercise Solved Examples|15 Videos

  • WORK, POWER & ENERGY

    CENGAGE PHYSICS ENGLISH|Exercise Exercise 8.1|25 Videos

  • VECTORS

    CENGAGE PHYSICS ENGLISH|Exercise Exercise Multiple Correct|5 Videos

Similar Questions

Explore conceptually related problems

A body is thrown with a velocity v_0 at an angle theta_0 with horizontal. Find the (a) instantaneous power delivered by gravity after a time t measured from the instant of projection and (b) average power delivered by gravity during the time t.

A particle of mass 2kg starts to move at position x=0 and time t=0 under the action of force F=(10+4x)N along the x- axis on a frictionless horizontal track . Find the power delivered by the force in watts at the instant the particle has moved by distance 5m .

A block of mas 2.0 kg is pulled up on a smooth incline of angle 30^0 with the horizontal. If the block moves wth an acceleration of 1.0 m/s^2 , find the power delivered by the pulling force at a time 4.0 s after the motion starts. What is the average power delivered during the 4.0 s after the motion starts?

A body of mass m is projected from ground with speed u at an angle theta with horizontal. The power delivered by gravity to it at half of maximum height from ground is

A car of mass m is accelerating on a level smooth road under the action of a single F. The power delivered to the car is constant and equal to P. If the velocity of the car at an instant is v, then after travelling how much distance it becomes double? .

A body is initially at rest. It undergoes one dimensional motion with constant acceleration. The power delivered to it at time t is proportional to

A body is initially at rest. It undergoes one dimensional motion with constant acceleration. The power delivered to it at time t is proportional to

A particle of mass m is moving along the line y-b with constant acceleration a. The areal velocity of the position vector of the particle at time t is (u=0)

A horizontal constant force F pulls a block of mass m placed on a horizontal surface. If the coefficient of kinetic friction between the block and ground is mu , find the power delivered by the external agent after a time agent after a time t measured from the beginning of action of the force.

A uniform rope of mass m hangs freely from a ceiling. A bird of mass M climbs up the rope with an acceleration a. The force exerted by the rope on the ceiling is