CBSE
In elastic collision
both momentum and kinetic energies are conserved
both momentum and kinetic energies are not conserved
only energy is conserved
only mechanical energy is conserved
A body rolls down an inclined plane. If its kinetic energy of rotation is 40% of its kinetic energy of translation, then the body is
solid cylinder
solid sphere
disc
ring
Force required to move a mass of 1 kg at rest on a horizontal rough plane (µ = 0.1 and g =9.8 ms-2) is
0.98 N
0.49 N
9.8 N
4.9 N
A body of mass 3 kg acted upon by a constant force is displaced by S' metre, given by relation , where t is in second. Work done by the force in 2 is
Two particles have masses m and 4m and their kinetic energies are in the ratio 2 : 1. What is the ratio of their linear momenta ?
The force F acting on a particle moving in a straight line is shown below. What is the work done by the force on the particle in the 1st metre of the trajectory ?
5 J
10 J
15 J
2.5 J
If the kinetic energy of a body changes by 20 %, then its momentum would change by
20 %
24 %
9.5 %
44 %
The work done in carrying a charge Q once around a circle of radius r about a charge q at the centre is
Zero
The displacement x of a particle at time t moving under a constant force is t = + 3, x in metre, t in second. Find the work done by the interval from t = 0 to t= 6 s.
Two blocks of 2 kg and 1 kg are in contact on a frictionless table. If a force of 3 N is applied on 2 kg block, then the force of contact between the two blocks will be
zero
1 N
2 N
3 N