A car is moving with a speed of 72 km/h towards a hill. Car blows horn at a distance of 1800 m from the hill. If echo is heard after 10 s, the speed of sound (in m/s) is

Two rain drops reach the earth with different terminal  velocities  having ratio 9:4 Then the ratio of their  volumes is

One litre of oxygen at a pressure of 1 atm and two litres of nitrogen at a pressure of 0.5 atm are introduced into a vessel of volume  1 L. It there  is no change in temperature . the final pressure of the fixture of gas (in atm) is

The orbit of geo -stationary satellite is circular,the time period of satellite depends on (iI) mass of the satellite (iiI) mass of the earth (iii) radius of the orbit (iv) height of the satellite from thesurface of earth

A particle is executing simple harmonic motion with an amplitude A and time period T. The displacement of the particles after 2T period from its initial position is

Two particles A and Binitially at rest move towards each other. under mutual firce of attraction. At aninstance when the speed of a is v and speed of B is 2v, the speed  of centre of mass (CM) is

A ball is dropped from a height h on a floor of coefficient of restitution e. The total distance covered by the ball just before second hit is

The energy (E) ,angular momentum (L) and universal gravitational constant(G) are chosen as fundamental quantities. The dimensions of universal gravitational  constant in the dimensional of planck's  constant(h) is

If a body is projected with an angle o to the horizontal, then

A river of salty water is flowing with a velocity 2 m/s. If the density of the water is 1.2 g/cc, then theinetic energy of each cubic metre of water is