Classical Mechanics Answers

a bullet 2 cm long is fired at 420 m/s and passes straight through a 10 cm thick wooden-board, penetrate at 280 m/s . (a) what is the average acceleration of the bullet through the board? (b) what is the total time that the bullet is in contact with the board? (c) what minimum thickness could the board have if it was supposed the bullet?

define momentum

Suppose that the force on a 1kg mass on the surface of the earth is 10N and that the radius of the earth is about 600 km. Then the force on an 8kg mass placed at a point 2000 km from the center of the earth will be?

Determine the total charge entering a terminal between t = 1 and t = 2 s and t = 2 s if the current passing the terminal is I = (3t² -t) A.

Suppose now that the momentum of the ball also has a y-component before it collides elastically with the wall. After the collision the x-component of the ball’s momentum changes but its y-component does not. If the momentum of the ball before the collision is ~p = px ˆi + py ˆj, what is its momentum after the collision.