A 4 kg object is moving 2 m/s to the right. A 6 N force pushes to the left for 3 seconds.
A. Calculate pbefore.
B. Calculate the impulse.
C. What is ∆p for this object?
D. What is its final momentum (pf )?

Two steel balls, each of mass m, are welded to a light rod of length l and negligible mass and are initially at rest on a smooth horizontal surface. a horizontal force of magnitude f is suddenly applied to the rod as shown. determine (a) the instantaneous acceleration a of the mass center g and (b) the corresponding rate at which the angular velocity of the assembly about g is changing with time.

How much energy is supplied to each coulomb of charge that flows through a 12-v battery?

Find v1, the speed of the fluid in the left end of the main pipe. express your answer in terms of h1, h2, g, and either a1 and a2 or γ, which is equal to a1a2.