Q. A projectile of mass 7 kg is fired with an initial speed of 193 m/s at an angle of 16? with the horizontal. At the top of its trajectory, the projectile explodes into two fragments of masses 4 kg and 3 kg. The 3 kg fragment lands on the ground directly below the point of explosion 1.6 s after the explosion.
Q. An alpha particle (q = +2e, m = 4.00 u) travels in a circular path of radius 4.50 cm in a uniform magnetic field with B = 1.20 T. Calculate (a) its speed, (b) its period of revolution, (c) its kinetic energy in electron- volts, and (d) the potential difference through which it would have to be accelerated to achieve this energy.