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StudyGuide1

# StudyGuide1 - OWL Homework 1 Solution Question There are...

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Answer: 30 ÷ 8.19 = 3.66 arcmin Question: The speed of light is 300,000 km/sec. How longs does it take light to travel 50 thousand km? Answer: 50,000 ÷ 300,000 = .667 seconds Question: The speed of light is 300,000 km/sec. How long would it take for a flashlight beam you shine at Venus to reach it when it is at its closest, about 41 million kilometers away from us? Express your answer in minutes. Answer: 41,000,000 ÷ 300,000 = 136.667 136.667 ÷ 60 = 2.278 minutes Question: Suppose you measure 5 Joules for the kinetic energy of a housefly. The housefly speeds up to 3 times faster than it was moving before. How many Joules of kinetic energy does the housefly have now? Answer: 5 x 3 x 3 = 45 Joules Question: Suppose you have a tennis ball tied to one end of a string and the other end tied to a pole. As you swing the ball on the string over you head, the string gets shorter and shorter as it wraps around the pole. When the string is 10 inches long, the ball is traveling at 5 meter per second. How fast would the ball travel when the string has become only 8 inches long?
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