The angular elevation of an enemy's position on a hill 'h' ft height is `alpha`.What should be the minimum velocity of the projectile in order to hit the enemy?

The angular elevation of an enemy's position on a hill 'h' ft height is alpha .Wha should be the minimum velocity of the projectile in order to hit the enemy?

An airplane is moving with velocity v_0 horizontally at a height h. If a projectile is fired at the instant when the plane is overhead, What must be the angle of projection amd minimum velocity of projection in order that it may hit the airplane ?

An airplane is moving with velocity v_0 horizontally at a height h. If a projectile is fired at the instant when the plane is overhead, what must be the angle of projection and minimum velocity of projection in order that it may hit the airplane ?

Four small particles charged with equal positive charges Q each are arranged at the four corners of a horizontal square of side a. A unit positive charge mass m is placed at a point P, at a height h above the centre of the square. What should be the magnitude of charge Q in order that the unit charge remain in equilibrium

Suppose the rod with the balls A and B of theprevious problem is clamped at the centre in such a way that it ca rotate freely about a horizontal axis through the clamp. The system is kept at rest in the horizontal position. A particle P of the same mass m is dropped from a heigh h hon the ball B. The particle collides with B and sticks to it. a. Find the angular momentum and the angular speed of the system just after the collision. b. What should be the minimum value of h so that the system makes a full rotation after the collision.