For a plane convex lens \((µ = 1.5)\) has radius of curvature 10 cm. It is silvered on its plane surface. Find focal length after silvering:
A mass of 1 kg is thrown up with a velocity of 100 m/s. After 5 seconds, it explodes into two parts. One part of mass 400 g comes down with a velocity 25 m/s, Calculate the velocity of other part:
A capacitor is charged with a battery and energy stored is \(U\). After disconnecting battery another capacitor of same capacity is connected in parallel with it. Then energy stored in each capacitor is:
Motion of a particle is given by equation \(S=(3t^3+7t^2+14t+8)\ m\), The value of acceleration of the particle at \(t=1 \ sec\) is:
The frequency order of for \(γ-rays\ (b), X–rays\ (a), UV–rays\ (c)\):
Two projectiles of same mass and with same velocity are thrown at an angle \(60º\) & \(30º\) with the horizontal, then which quantity will remain same:
The width of river is 1 km. The velocity of boat is 5 km/hr. The boat covered the width of river with shortest will possible path in 15 min. Then the velocity of river stream is:
For the given reaction, the particle X is: 6C11→5B11+β++X