Q1. An engine does 20000 J of work and rejects 6120 J of heat into a cold reservoir whose temperature is 285 K. What would be the smallest possible temperature of the hot reservoir?
Q2. A string of 11 identical Christmas tree lights are connected in a series to a 128v source. The string dissipates 78 watts. What is the equivalent resistance of the light string?
Q3. If the accelerating plates are 2.9 cm apart, and have a potential difference of 28,000 V, what is the magnitude of the uniform electric field between them?