Work, Energy and Power questions
712 published questions with worked solutions.
- A particle of mass 100 g is thrown vertically upwards with a speed of 5 ms⁻¹. The work done by the force of gravity during the...
- A spring, which is initially in its unstretched condition, is first stretched by a length x and then again by a further length x....
- To the free end of a spring hanging from a rigid support, a block of mass m is hung and slowly allowed to come to its equilibrium...
- A running man has the same kinetic energy as that of a boy of half his mass. The man speeds up by 2 ms⁻¹ and the boy changes his...
- The potential energy of a 1 kg particle free to move along the x-axis is given by V(x) = (x⁴/4 − x²/2) J. The total mechanical...
- Two masses of 1 g and 4 g have the same kinetic energy. What is the ratio of their momenta?
- A body moving with velocity v has momentum and kinetic energy numerically equal. What is the value of v?
- A steel ball of mass 5 g is thrown downward with velocity 10 ms⁻¹ from height 19.5 m. It penetrates sand by 50 cm. The change in...
- A river of salty water is flowing with a velocity 2 ms⁻¹. If the density of the water is 1.2 g/cc, then the kinetic energy of...
- A mass m is attached to the end of a rod of length l. The mass goes around a vertical circular path with the other end hinged at...
- The kinetic energy of a body becomes four times its initial value. The new momentum will be [WB-JEE 2007]
- A body of mass 5 kg is thrown vertically up with a kinetic energy of 490 J. The height at which the kinetic energy of the body...
- A cubical vessel of height 1 m is full of water. What is the amount of work done in pumping water out of the vessel? (Take g = 10...
- A spring gun of spring constant 90 N cm⁻¹ is compressed 12 cm by a ball of mass 16 g. If the trigger is pulled, the velocity of...
- A rod of mass m and length l is made to stand at an angle of 60° with the vertical. The potential energy of the rod in this...
- The potential energy function for the force between two atoms in a diatomic molecule is approximately given by U(x) = a/x¹² −...
- Two springs P and Q of force constants k_P and k_Q (k_Q = k_P/2) are stretched by applying forces of equal magnitude. If the...
- A particle is moving under the influence of a force given by F = kx, where k is a constant and x is the distance moved. The...
- Two springs of spring constants 1500 N m⁻¹ and 3000 N m⁻¹ respectively are stretched with the same force. They will have...
- A body of mass 6 kg is acted upon by a force which causes a displacement in it given by x = t²/4 metre, where t is the time in...
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