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A horizontal force, just sufficient to move a body of mass 4kg lying on a rough horizontal surface is applied on it. The coefficients of static and kinetic friction between the body and the surface are 0.8 and 0.6 respectively. If the force continues to act even after the block has started moving, the acceleration of the block in ms−2 is [g = 10 m s − 2 ]
What will be the ratio of de Broglie wavelengths of proton and α-particle of same energy
The pressure and temperture of an ideal gas in a closed vessel are 720 kPa and 40oC respectively. If 1/4th of the gas is released from the vessel and the temperature of the remaining gas is raised to 353oC, the final pressure of the gas is
A spherical drop of water has 1 mm radius. If the surface tension of water is 70 x 10⁻3 N-m⁻1, then difference of pressures between inside and outside of spherical drop is
How much force is required to produce an elongation of 0.2% in the length of a brass wire of diameter 0.6 mm? (Take Young's modulus for brass = 0.9 x 1011 N-m⁻2)
A body falls from rest in the gravitational field of the earth. The distance travelled in the fifth second of its motion is (g=10 m/s2)
A boy having a mass equal to 40 kilograms is standing in an elevator. The force felt by the feet of the boy will be greatest when the elevator (g=9.8 metres/sec2)
If a spring extends by x on loading then energy stored in the spring is (if T is the tension and k is the force constant of the spring)
When a mass is rotating in a plane about a fixed point, its angular momentum is directed along