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# Test 1 - Physics 221 Test 1 This is a 1-hour test You may...

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Physics 221, Test 1 This is a 1-hour test. You may omit two questions. Instructions: Use g = 10 m/s 2 for the magnitude of the gravitational acceleration. The only formulas provided are those for harmonic motion. x(t) = Acos( ω t + φ ) v(t) = - ω Asin( ω t + φ ), a(t) = - ω 2 Acos( ω t + φ ) = - ω 2 x. ω = sqrt(k/m) = 2 π f = 2 π /T. Question 1 Four different mice (labeled A, B, C, and D) ran the triangular maze shown below. They started in the lower left corner and followed the paths of the arrows. The times they took are shown below each figure, (i) Which mouse had the greatest average speed? (ii) Which mouse had the greatest average velocity? (i) D, (ii) C (i) B, (ii) A (i) A, (ii) D (i) B, (ii) C Question 2 A drag racer starts from rest and accelerates to a speed of 76.5 m/s in 8.5 seconds. What is the acceleration of the car? 2.1 m/s 2 68 m/s 2 9 m/s 2 650 m/s 2 Question 3 If only conservative forces act on a system, the total mechanical energy of the system remains constant. True False

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Question 4 A cart can move to the right or left along a horizontal track (the positive part of the x axis) as shown in the figure below. Neglect friction. A force is applied to the cart. Choose an appropriate force versus time graph for each statement below. (i) The cart moves toward the right (away from the origin) with constant velocity.
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Test 1 - Physics 221 Test 1 This is a 1-hour test You may...

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