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Midterm 3 Solution

# Midterm 3 Solution - 1 An egg(0.05 kg is just about to hit...

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1. An egg (0.05 kg) is just about to hit a dorm window at a speed of 20 m/s (44 mph)? What units can we use to describe the kinetic energy of the egg? Circle all that can be used. A) Calories only B) Joules only C) kg m^2/s^2 only D) kilowatt-hours only All 2. How much potential energy does a 70 kg hiker gain by climbing up the Grouse Grind (elevation gain 800 m). 70*9.8*800 ≈ 550kJ 3. Both solar energy and radioactivity of the earth’s crust deliver a lot of energy to the Earth, which all ends as heat. So why doesn't planet Earth keep getting hotter and hotter? A) The oceans keep us cool B) The amount of heat is too small to notice C) We are heating up, that's global warming D) The energy gets radiated out into space E) The powerful lobby of the cloth manufacturers and fashion designers prevents this from happening

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4. A hiker 1.8 m tall weighing 70 kg noticed that he needs an additional food intake of 260 kcal if he walks for 5.8 km instead of sitting down and watching TV. How many muffins can he burn if he climbs up the Grouse Grind (elevation 800 m, trail length 2.9
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