Q1. A 12.0-{rm kg} box resting on a horizontal, frictionless surface is attached to a 5.00-{rm kg} weight by a thin, light wire that passes over a frictionless pulley). The pulley has the shape of a uniform solid disk of mass 2.40 {rm kg} and diameter 0.600 {rm m}.

Q2. As a member of the safety group for the space shuttle scientific program, you have been asked to evaluate an electronics design change. In sequence to improve reliability of the circuit to be used in the next shuttle flight, experimental design team has suggested adding a second 17 V battery to the circuit. The equivalent resistances of the proposed design are shown below. You are worried about the heat generated by the device with the 30 ohm resistance since it would be located next to the sensitive low temperature experiment so you do the appropriate calculation for the power.