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JEE 2020 Physics: Work, Energy and Power Quiz 3 (30.07.2019)

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Question 1

An object is dropped from a height h from the ground. Every time it hits the ground it loses 50% of its kinetic energy. The total distance covered as is:

Question 2

A metallic wire of length L metres extends by l metres when stretched by suspending a weight Mg to it. The mechanical energy stored in the wire is

Question 3

A particle with total energy E moves in one dimension in a region where the potential energy is U(x). The acceleration of the particle is zero where

Question 4

The given plot shows the variation of U, the potential energy of interaction between two particles with the distance separation them, r–

fig95

(1) B and D are equilibrium points

(2) C is a point of stable equilibrium

(3) The force of interaction between the two particles is attractive between points C and D and repulsive between point D and E on the curve.

(4) The force of interaction between the particles is repulsive between points E and F on the curve.

Which of the above statements are correct?

Question 5

The potential energy function associated with the forceis:

Question 6

A particle is projected vertically upwards with a speed of 16 m/s, after some time, when it again passes through the point of projection, its speed is found to be 8 m/s. It is known that the work done by air resistance is same during upward and downward motion. Then the maximum height attained by the particle is (Take g = )

Question 7

The potential energy of a particle of mass m free to move along the x-axis is given by for x < 0 and U = 0 for (x denotes the x-coordinate of the particle and k is a positive constant). If the total mechanical energy of the particle is E, then its speed at

Question 8

A particle is projected along a horizontal field whose coefficient of friction varies as where r is the distance from the origin in meter and A is a positive constant. The initial distance of the particle is 1 m from the origin and its velocity is radially outwards. The minimum initial velocity at the point so that particle never stop is–

Question 9

A peculiar force acting upon an object has the equation ,where x is the displacement of the object from some origin and c = 1 N/. What is the magnitude of the work done by the force on the object as the object moves from m to

Question 10

Graph shows the acceleration of a 3 kg particle as an applied force moves it from rest along x-axis. The total work done by the force on the particle by the time the particle reaches x = 6 m, is equal to–

fig84

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Jun 15JEE & BITSAT