Question

QUESTION 1

Part A

A box of mass m1 rests on a smooth, horizontal floor next to a box of mass m2. Suppose the force of 20.0 N pushes on two boxes of unknown mass. We know, however, that the acceleration of the boxes is 1.20 m/s2 and the contact force has a magnitude of 4.45 N. Find the mass of box 1 and box 2.

Express your answers using three significant figures separated by a comma.

QUESTION 2

A 47.5 kg swimmer with an initial speed of 1.30 m/s decides to coast until she comes to rest.

Part A

If she slows with constant acceleration and stops after coasting 2.30 m , what was the magnitude of the force exerted on her by the water?

QUESTION 3

A 56 kg skier encounters a dip in the snow's surface that has a circular cross section with a radius of curvature of 12 m.

If the skier's speed at point A in the figure is 8.0 m/s , what is the normal force exerted by the snow on the skier at point B? Ignore frictional forces.(Figure 1)

Express your answer using two significant figures.

Answer 1