PHY2020_Exam1_SOLUTIONS_v2

# PHY2020_Exam1_SOLUTIONS_v2 - PHY2020 Fall 2011 Test 1 I...

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PHY2020 Fall 2011, Test 1 I understand that the University of Florida expects its students to be honest in all their academic work. I agree to adhere to this commitment to academic honesty and understand that my failure to comply with this commitment may result in disciplinary action up to and including expulsion from the University. Name: _____________________________________________________ UF ID: _____________________________________________________

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Ignore air friction in all problems. Please give complete responses to all questions including units and theoretical justification for responses. You must show ALL of your work to receive full credit! Useful values and formulas: G = 6.7 10 -11 N m 2 / kg 2 M Earth = 5.98 * 10 24 kg R Earth = 6378 km 1 km = 0.62 miles 1 kg = 2.2 lbs
1. (9 pts) What are the standard (SI) units used for distance, time, and mass? Distance = meters (m) Time = seconds (s) Mass = kilograms (kg) 2. (9 pts) Draw the path of an object in uniform circular motion. Indicate the directions of the velocity, acceleration, and force vectors at one point of your choice along that path. Velocity vector Force, acceleration vectors Office 2004 Test Drive , 9/19/11 7:31 PM Deleted: any

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3. (10 pts) What is Newton’s first law? Write down the law, and give a real life example. Be very specific.
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