Home
Class 11
PHYSICS
A 50 kg girl is swinging on a swing from...

A 50 kg girl is swinging on a swing from rest. Then the power delivered when moving with a velocity of 2m/sec upwards in a direction making an angle 60º with the vertical is

A

980W

B

490W

C

`490sqrt3W`

D

245W

Text Solution

Verified by Experts

The correct Answer is:
B
Doubtnut Promotions Banner Mobile Dark
|

Topper's Solved these Questions

  • SHM-WAVE,GRAVITATION,FLUID,HEAT

    MOTION|Exercise EXERCISE|109 Videos

Similar Questions

Explore conceptually related problems

A girl of mass 40 kg sits in a swing formed by a rope of 6 m length. A person pulls the swing to a side so that the rope makies an angle of 60^(@) with the vertical. What is the gain in potential energy of the girl ?

A bob of mass 2 kg hangs from a string of length 5 m . It swings from its rest position to one of the sides so that the string makes an angle of 60^(@) with the vertical Calculate the gain in potential energy of the bob .

Knowledge Check

  • A 50 kg girl is swinging on a swing from rest. Then, the power delivered when moving with a velocity of 2ms^(-1) upwards in a direction making an angle 60^(@) with the vertical is

    A
    490`sqrt3W`
    B
    490 W
    C
    `490sqrt2W`
    D
    245 W

  • A 400 kg car attains a speed of 50 m/s from rest in 20s. The power developed in the engine will be

    A
    50 W
    B
    0.5 W
    C
    5 kW
    D
    25 kW

  • A billiard ball moving at a speed of 6.6 ms–1 strikes an identical stationary ball a glancingblow. After the collision, one ball is found to be moving at a speed of 3.3, ms–1 in a direction making an angle of 60º with the original line of motion. The velocity of the other ball is

    A
    `4.4 ms^(-1)`
    B
    `6.6ms^(-1)`
    C
    `3.3ms^(-1)`
    D
    `5.7ms^(-1)`

    • Similar Questions

    Explore conceptually related problems

    A bird is moving with velocity 10 ms?^(-1) in a direction making an angle of 60^@ with vertical upward. Represent the velocity vector in rectangular form.

    An apple of mass 0.5 kg is swing around on a string in a circle in a horizontal plane with a constant speed. The string makes an angle alpha with the vertical (See the figure). The radius R of the circle is 3.0 m, it takes 2.0sec for the apple to make one complete rotation, the direction of rotation is indicated in the figure, the apple, at S, is coming towards you. Q is the center of the circle, QP is vertical SQ is in the +x direction, QP in the +y direction, and the +z direction is tangent to the circle at S and points towards you. Assume that g=10m//sec^(2) and that the string is massless. The apple's centripetal acceleration and angular velocity respectively at S is :

    In the previous problem. If the bullet is moving with velocity 50 sqrt(2) m//s , the maximum angle made by string with vertical is

    The escape velocity for a body projected vertically upwards from the surface of the earth is 11.2 km s^(-1) . If the body is projected in a direction making an angle 45^@ with the vertical, the escape velocity will be

    The escape velocity of a body projected vertically upwards from the surface of the earth is v.If the body is projected in a direction making an angle theta with the vertical, the vetical, the escape velocity would be

    Home
    Profile