Key_PHYS111_Midterm-0230_Mark_Corrected_SP07_5-02-07

Key_PHYS111_Midterm-0230_Mark_Corrected_SP07_5-02-07 -...

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MIDTERM Page 1 of 5 NAME __________ KEY ________________ RECITATION INST ________ KEY _____________ GRADE _______ KEY _______________ Physics 111 2:30 section Professor Epstein SP07 48 minutes May 2, 2007 Midterm Equations Motion with Constant Acceleration 2 0 0 1 2 x x v t at = + + 0 0 2 2 0 0 ( ) 2 2 ( ) v v x t v v at v v a x x + ∆ = = + = + - Quadratic Equation If 2 0 ax bx c + + = , then 2 4 2 b b ac x a - - = Newton’s 2 nd Law net F F ma = = ur ur r Means x x F ma = and y y F ma = Force 1 2 2 11 2 2 2 6.67 10 / 9.80 m/s , near surface of Earth s s N k k N f F f F Gm m F r G N m kg w mg g μ - = = = = = Conditions for Equilibrium 0 net F F = = ur ur
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MIDTERM Page 2 of 5 NAME _________ KEY _______________ RECITATION INST___ ____ KEY __________________ Physics 111 2:30 section Professor Epstein SP07 48 minutes May 2, 2007 Questions 1 through 10 are multiple choice, 5 points each. 1. You step on a hot stone path with your bare feet. A nerve impulse, generated in your foot, travels through your nervous system at an average speed of 110 m/s. How much time does it take for the impulse, which travels a distance of 1.71 m, to reach your brain? ( 5 points) (a) 64.3 s (b) 7.73 x 10 -3 s ** (c) 1.55 x 10 -2 s (d) 1.60 x 10 -2 s 2. A baseball is thrown straight (horizontally) off the edge of a cliff that is 45 m high. A tourist observed that the point of impact is 99 m from the base of the cliff. How fast was the baseball traveling when it went over the cliff? (5 points) (a) 10.0 m/s ** (b) 32.7 m/s (c) 14.9 m/s (d) 4.59 m/s 3. A park ranger being chased by an angry wolf is running in a straight line towards her car at a speed of 3.25 m/s. The car is a distance d away. The wolf is 30.0 m behind the park ranger and running at 6.50 m/s. The park ranger reaches her car safely. What is the maximum possible value for d ? (5 points) (a) 60.0 m (b) 20.0 m (c) 40.0 m ** (d) 30.0 m 4. The left ventricle of the heart accelerates blood from rest to a velocity of 0.250 m/s. The displacement of the blood during the acceleration is 0.0215 m.
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Key_PHYS111_Midterm-0230_Mark_Corrected_SP07_5-02-07 -...

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