PY211 Summer13 Test 1

# B pointing straight up into the air c pointing a

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B. Pointing straight up into the air. C. Pointing a little backward opposite the direction the car is moving. D. It depends on the relative initial velocity of the ball and the velocity of the car. 3. A plane flies with an air speed of 350.0 mph. What is the plane’s speed relative to the Earth if the air is blowing at 50.0 mph and perpendicular to the plane? A. 400 mph B. 354 mph C. 346 mph D. 300 mph E. 350 mph

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4. Two vectors A and B are oriented head-to-tail so that there is 130° between them as shown . What must be true about the magnitude R of the resultant vector R = A + B ? Note, all variables below are magnitudes: A. R < 0 B. R = A + B C. R 2 = A 2 + B 2 D. R > A + B E. R < A + B 5. If 1.00 pounds = 4.45 Newtons, how many Newtons are in 12.3 pounds? The questions 6-8 reference to the following situation: A man walks 2 mi east then 1 mi north then 2 mi west then 1 south. The whole trip takes 3 hours. 6. What is the man’s displacement? 7. What is the man’s average speed?

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• Fall '07
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