Achild pulls a balloon for 12 m with a force of 1.0 n at an angle of 60 below horizontal. how much work does the child do on the balloon?

Apulley with mass mp and a radius rp is attached to the ceiling, in a gravity field of 9.81 m/s2 and rotates with no friction about its pivot.

What is the power rating of the lightbulb if 3.0 a flow through it when connected to a 15 v battery

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.