Home
Class 11
PHYSICS
A rod is hinged at its centre and rotate...

A rod is hinged at its centre and rotated by applying a constant torque starting from rest. The power developed by the external torque as a function of time is :

A

B

C

D

Text Solution

Verified by Experts

The correct Answer is:
B
`P = tau. omega rArr P = tau alpha trArr P = tau. (tau)/(I) t rArr P = (tau^(2))/(I) t rArr P prop t`.
Doubtnut Promotions Banner Mobile Dark
|

Similar Questions

Explore conceptually related problems

A wheel rotating at a speed of 120 rpm about its axis is brought to rest by applying a constant torque for 4 s . Find the number of revolutions completed by the wheel before stop.

Engine of car of mass m supplies a constant power P. Starting from rest at an instant of time, then

Knowledge Check

  • A motor rotates at a constant speed of 25 rev/s. The power delivered by the motor, if it supplies a torque of 60 Nm, is

    A
    2500 Nm
    B
    0.42 Nm
    C
    0.042 Nm
    D
    `3000 pi W`

  • A constant power P is applied to a car starting from rest If v is the velocity of the car at time t,then

    A
    `v prop t`
    B
    `v prop 1/t`
    C
    `v prop sqrtt`
    D
    `v prop 1/sqrtt`

  • A constant power P is applied to a car starting from rest If v is the velocity of the car at time t,then

    A
    `v prop t`
    B
    `v prop 1/t`
    C
    `v prop sqrtt`
    D
    `v prop 1/sqrtt`

    • Similar Questions

    Explore conceptually related problems

    A uniform disc of mass 20 kg and radius 0.5 m can turn about a smooth axis through its centre and perpendicular to the disc. A constant torque is applied to the disc for 3s from rest and the angular velocity at the ned of that time is (240)/(pi)rev//min find the magnitude of the torque. if the torque is then removed and the disc is brought to rest in t seconds by a constant force of 10 N applied tangentially at a point on the rim of the disc, find t

    A wheel rotating ast a speed of 600 rpm (revolutions per minute) about its axis ils brought to rest by applying a constant torque for 10 seconds. Find the angular deceleration and the anglular velocilty 5 seconds after the application of the torque.

    A constant power P is applied to a car starting from rest. If v is the velocity of the car at time t, then:

    A wheel is rotating about an axis through its centre at 720 rpm. It is acted on by a constant torque opposing its motion for 8 s to bring it to rest finally. The value of torque (in Nm) is (Given I = 24/3 "kg m"^2 )

    A pulley is hinged at the centre and a massless thread is wrapped around it. The thread is pulled with a contant froce F starting from rest. As the time increases - .

    Home
    Profile