Midterm%201%20Solution

# Midterm%201%20Solution - 1 Which is not an energy...

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1. Which is not an energy unit? (Choose all that apply) A) Cal B) kcal C) kWh D) Btu E) MJ/day 2. Imagine a cold winter morning with a temperature of -5 0 C outside. You're not planning on being in the house during the day. If you turned the thermostat down from 20 0 C to 15 0 C, approximately what percentage of your heating energy do you save? A. 10% B. 20% C. 25% D. 30% E. negligible (below 1%) F. None of the above/something else. 3) Recently, two professional BMX riders performed stunts at UBC with their bicycles. Many of these stunts involve riding up a ramp and getting air-borne (see picture). According to the energy bar diagram, where is the rider? (This is not necessarily the position shown in the picture.) The potential energy is zero at h = 0 and the height scale is indicated. A) At the bottom of the ramp. B) At the top of the ramp. C) Going up the ramp. D) In mid-air going up or down. E) In mid-air at the highest point. h = h max h = ½ h max Kin.

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