U-15 completely filled with cement
1.1 m
figure 2. container filled with cement
if the mass of the cement is 15 000 kg, calculate the density of space
in kg m?

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.