Three solids of masses m₁,m₂ and m₃ are connected with weightless string in succession and are placed on a frictionless table.If the mass m₃ is dragged with a force.T the tension in the string between […]
The kinetic energy of particle moving along a circle of radius R depends upon the distance s as k= as².Then the force acting on particle is
Options
(a) 2as²/R (b) 2as [ 1 […]
Two balls of mass m₁ and m₂ are separated from each other by powder charge placed between them.The whole system is at rest on the ground.Suddenly, the powder charge explodes and masses are pushed part.The […]
A force acts on a 3.0 g particle in such a way that the position of the particle as a function of time is given by x = 3t – 4t² + t³ , where […]
The potential energy of a weightless spring compressed by a distance D is proportional to
Options
(a) D (b) D⁰ (c) D² (d) D⁻²
Correct Answer:
D⁻²
Explanation:
No explanation available. Be the […]
A ball is dropped from a height of 20 cm. Ball rebounds to a height of 10cm. What is the loss of energy?
Options
(a) 25% (b) 75% (c) 50% (d) 100%
Correct […]
When a spring is extended by 2 cm energy stored is 100 J. When extended further by 2 cm, the energy increases by
Options
(a) 300 J (b) 400 J (c) 200 J (d) […]
A neutron moving with velocity v collides with a stationary particle. The velocity of the neutron after the collision is
Options
(a) -3v/5 (b) 3v/5 (c) 2v/5 (d) -2v/5
Correct Answer:
-3v/5
Explanation: […]
A force of 5 N is acting on an object. Displacement of object is 10 m and the work done on it is 25 J. The angle between force and displacement is
Options
A bomb of mass 30 kg at rest exploded into two pieces of masses 18 kg and 12 kg. The velocity of 18 kg mass if 6 m/s. The kinetic energy of the other mass […]
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