1. In the figure below, the horizontal surface on which the objects slide is frictionless. If F = 12 N, what is the tension in string 1?
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2. An 8.0-kg object rests on the floor of an elevator which is accelerating downward at a rate of 1.3 m/s2. What is the magnitude of the force (in N) that the object exerts on the floor of the elevator?