Semiconductors — Physics STD 11 Science — Question

The maximum height attained by projectile is found to be equal to 0.433 of the horizontal range. The angle of projection of this projectile is

A river is flowing from west to east at a speed of 4 m/min. In what direction should a man on the south bank of the river, capable of swimming at 8 m/min in still water, swim to cross the river in the shortest time?

In the crystal of pure Ge or Si, each covalent bond consists of …………..

Variation of acceleration due to gravity (g) with distance x from the centre of the Earth is best represented by (R → Radius of the Earth)

An aeroplane is flying at a constant horizontal velocity of 600 km/hr at an elevation of 6 km towards a point directly above the target on the earth's surface. At an appropriate time, the pilot releases a ball so that it strikes the target at the earth. The ball will appear to be falling

Two men A and B support the ends of a uniform beam 2 m long and weighing 50 kg. A weight of 50 kg hangs from the beam from a point 0.5m from A. Assuming the bar is horizontal, the load shared by each man is

The sum of moments of all the particles in a system about its centre of mass is always ______________ .