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Midterm+Physics+3A - Midterm Physics 3A Formulae x = x0 v0t...

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Midterm Physics 3A February 12, 2007 Formulae: x = x 0 + v 0 t +½at 2 v = v 0 + at 2a(x – x 0 ) = v f 2 – v 0 2 R = v i 2 sin2θ i /g h = v i 2 sin 2 θ i /2g a = v 2 /r F = ma F f = μN g = 9.80m/s 2 1mi = 1.609 x 10 3 m
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Multiple Choice (10 points each). Circle letter of correct answer. 1. A car accelerates from rest to 120mi/hr in 6.0s. What is the average rate of acceleration in m/s 2 ? (a) 4.9m/s 2 (b) 8.9m/s 2 (c) 9.8m/s 2 (d) 534m/s 2 (e) 0.5m/s 2 2. A projectile is shot up from the Earth’s surface at 50° at 20.0m/s. To what altitude does this projectile rise?
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3. A car accelerates from rest W at 5.0m/s 2 for 10.0s, then continues this acceleration NE for another 10.0s. What is the average velocity of the car for its journey to its position after 20.0s? 4. A person stands on the inside of a 100m diameter circular rim in outer space. The rim is rotating to simulate the force of Earth’s gravity on the person. At how many revolutions per minute must it rotate to simulate the effect of ½ that of gravity at the Earth’s surface?
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