Ablock of mass 9.5kg rests on a slope an angle of 23.0∘ relative to the horizontal. what is the size of the contact force normal to the slope, in newtons? use a gravitational acceleration value of g = 9.8m/s^2.

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.