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# practice_1 - Physics 140 Fall 2005 Midterm 1 1(P An empty...

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Physics 140 Fall 2005 Midterm 1 1. (P) An empty 700-kg elevator suspended from a single cable is accelerating vertically downward at 3.0 m/s 2 . What force is exerted on the elevator by the cable? 3VECTORS.GIF a) 2.1kN, down b) 2.1kN, up c) 4.8kN, down d) 4.8kN, up e) 9.0kN, up 2. Buttons are lined up along the diameter of a circular platter that rests on a horizontal table. As the platter is spun up to a rate of 33 revolutions per minute, the buttons lying a distance greater than 0.1m from the center are observed to fly off. What is the coefficient of static friction between the platter and the buttons? 1

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Physics 140 Fall 2005 Midterm 1 3. n the tug of war shown below, each team pulls on the rope with a force of 200-lb. The tension in the rope is FUZZYDIE.GIF 4. In a video game, a villain in an elusive maneuver flies across the screen according to the programmed trajectory (in pixel units) r = (800–4 t +8 t 2 ) i + (920 + 2 t + 6 t 2 ) j , where i is in the horizontal and j the vertical directions. At what time is the velocity of villain aligned with the screen diagonal? 2
Physics 140 Fall 2005 Midterm 1 5. A “solar sail” spacecraft would use the slight pressure of radiation from the sun to generate thrust for interplanetary travel. If the spacecraft starts essentially from rest well above the Earth, and experiences a constant, net acceleration of 10 -5 g for the whole journey, how long would it take to reach Pluto, a distance of 7.6 x 10 12 m away? (Recall that there are about π x 10 7 s in one year) a) 2.5 yr b) 12.5 yr c) 48 yr d) 69 yr e) 125 yr

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