JEE 2020 Physics: Work, Energy and Power Quiz - 1 (25.07.2019) (App update required to attempt this test)

A body is moved along a straight line by a machine delivering constant power. The distance moved by the body in time t is proportional to

The kinetic energy acquired by a mass m in travelling a certain distance d starting from rest under the action of a constant force is directly proportional to

A bob is suspended from a crane by a cable of length metre. The crane and load are moving at a constant speed v₀. The crane is stopped by a bumper and the bob on the cable swings out to an angle of 60°. The initial speed v₀ is (g = 9.8 m/s²).

A 40 kg mass, hanging at the end of a rope of length , oscillates in a vertical plane with an angular amplitude θ₀. if the breaking strength of the rope is 80 kg f, the maximum value of angular amplitude (θ₀) comes to as . What is the value of n?

A chain is in the form of a heap at the edge of a table. Suddenly one end of the chain starts falling down. When length of the chain below the edge of the table is h, the velocity of its lower end is found to be v. Using dimensional method obtain the value of v (in m/s) when h = 0.6 m (Given that g = 10 m/s²).

Two springs have their force constant as k₁ and k₂(k₁ > k₂). When they are stretched by the same force

The Gardener water the plants by a pipe of diameter 1 mm. The water comes out at the rate of 10 cm³/ sec. The reactionary force exerted on the hand of the Gardener is: (density of water is 10³ kg/m³)

The work done by the frictional force on a surface in drawing a circle of radius r on the surface by a pencil of negligible mass with a normal pressing force N (coefficient of friction µ_k) is :

When a conservative force does positive work on a body

The P.E. of a certain spring when stretched from natural length through a distance 0.3 m is 10 J. The amount of work in joule that must be done on this spring to stretch it through an additional distance 0.15 m will be