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Unformatted text preview: PHYS2014/Fall 2010/Exam No. 2 Name:___________________________________ OSU Physics Dept./Benton Recitation TA _________Recitation Time:_______ Physics 2014: General Physics I Solutions to Exam No. 2 19 October 2010 1. Mr. Halitosis drives a car that is so old it doesn’t even have cup holders. As a result, he is in the habit of placing his morning cup of coffee on a level portion of the dashboard. The coffee + cup + (fortunately) lid have a combined mass of 0.15 kg. If Mr. Halitosis can take a 20 m radius curve at 30 mph (13.4 m/s) without the full coffee cup sliding across the dashboard (and into his lap), what must be the minimum coefficient of friction between the full coffee cup and the dashboard? Solution: Start by drawing a free body diagram and labeling the forces. The force of friction acting towards the center of the curve provides the centripetal force that prevents the cup from sliding. 2 y N N x f f s N s s F F mg F mg mv F F r F F mg m μ μ μ = = − = = = = = m g = ( ) 2 2 2 2 m 13.4 s 0.92 m 9.80 20m s s v r v gr μ = = = ⋅ r = 2 m r = 2 m f F a N F a mg − a PHYS2014/Fall 2010/Exam No. 2 Name:___________________________________ OSU Physics Dept./Benton Recitation TA _________Recitation Time:_______ 2. Callisto is the second largest of Jupiter’s many moons and the third largest moon in the solar system with a mass of 1.08 × 10 23 kg and a radius of 2410 km. a) What is the acceleration due to gravity on the surface of Callisto? b) Given that the mean radial distance between Callisto and Jupiter is 1.88 × 10 9 m and that the mass of Jupiter is 1.90 × 10 27...
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This note was uploaded on 11/28/2011 for the course PSYCH 2014 taught by Professor Staff during the Fall '10 term at Oklahoma State.
- Fall '10