# Test_1_B - PHYS 2425 Dr Honan Test 1 B Possibly Useful...

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PHYS 2425 - Dr. Honan - Test 1 - B Name______________ Possibly Useful Information: 1 liter = 10 -3 m 3 1 ft = 0.3048 m 1 hr = 3600 s g = 9.80 m/s 2 Problem 1 Multiple Choice (3 points each) ______ [i] When a ball is thrown horizontally out of a window at a speed of 18 m/s it hits the ground at a speed of 30 m/s. If a ball were dropped out the same window, what would be its speed when it hit the ground? (a) 0 m/s (b) 12 m/s (c) 18 m/s (d) 24 m/s (e) 30 m/s (f) 35 m/s (g) 48 m/s (h) none of the above ______ [ii] A 150 lb person stands in an elevator that moves downward and has an upward acceleration of g/3. What is the normal force of the floor on the person? (a) 50 lb (b) 100 lb (c) 150 lb (d) 200 lb (e) 250 lb (f) none of the above Problem 2 (2 points each) The graph to the right shows the trajectory of a car. At position P the car’s speed is decreasing . Complete the table below with the signs of the components of the car’s velocity v and acceleration a at point P. Answer +, - or 0.

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## This document was uploaded on 02/01/2010.

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Test_1_B - PHYS 2425 Dr Honan Test 1 B Possibly Useful...

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