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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–
(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–
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Jun 15JEE & BITSAT