40% of 4500 = 1800 Or, 30% of R = 1800 So, R = 1800 ÷ 0.3 = 6000 Hence, option a.
Two billiard balls each of mass 0.02 kg moving in opposite directions with speed 5 m s−1 collide and rebound with the same speed. What is t...
For a non-relativistic particle, the ratio of phase velocity to group velocity of de Broglie waves is:
A body is thrown upward with an initial velocity of 20m/s. How much time will it take to reach its maximum height. (g=10m/s)
A ray of light passing through an equilateral triangular glass prism from air undergoes minimum deviation when angle of incidence is 75% of the angle o...
A spherical ball made of steel when dropped in mercury container will –
Which of the following particles in motion, having the same kinetic energy, has the shortest wavelength?
In AC circuits, AC meters measure –
If the Earth stopped rotating, what would happen to the apparent value of gravity (g) at different locations?
A porter lifts luggage of 20 kg from the ground and puts it on his head 2 m above the ground. Calculate the work done by him on the luggage (take g = 10...
A stone thrown upward with a speed ’u’ from the top of the tower reaches the ground with a speed ‘3u’. The height of the tower is-
