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Class XI Physics Work, Energy and Power 2

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Question 1

A particle moves in a straight line with retardation proportional to its displacement. Its loss of kinetic energy for any displacement x is proportional to

Question 2

A particle of mass m and charge q is fastened to one end of a string of length l. The other end of the string is fixed to the point O. The whole system lies on a frictionless horizontal plane. Initially, the mass is at rest at A. A uniform electric field in the direction shown is then switched on. Then

Question 3

The displacement x of a body of mass 1kg on horizontal smooth surface as a function of time t is given by x = t⁴/4. The work done in the first one second is–

Question 4

A body moves a distance of 10m along a straight line under the action of a force of 5N. If the work done is 25 J , the angle which the force makes with the direction of motion of the body is-

Question 5

Consider a rubber ball freely falling from a height h = 4.9 m onto a horizontal elastic plate. Assume that the duration of collision is negligible and the collision with the plate is totally elastic.
Then the velocity as a function of time and the height as a function of time will be :

Question 6

The potential energy of a 1 kg particle free to move along the positive x-axis is given by
.
The total mechanical energy of the particle is 2 J. Then, the maximum speed (in m/s) is

Question 7

A particle of mass 100 g is thrown vertically upwards with a speed of 5 m/s. The work done by the force of gravity during the time the particle goes up is

Question 8

The potential energy of a particle is determined by the expression U = α (x²+ y²), where α is a positive constant. The particle begins to move from a point with the coordinates (3, 3) (m), only under the action of potential field force. Then its kinetic energy T at the instant when the particle is at a point with the coordinates (1, 1) (m) is

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Mar 18JEE & BITSAT