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The rules, conversion factors, and problems for a physics a exam 4 held on november 14/15, 2001. The exam includes five problems, with a total of 83 points, covering topics such as forces, work, energy, and motion. The exam also provides conversion factors for various units, such as miles to feet, hours to minutes, and pounds to kilograms.
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Conversion Factors: 1 mile= 5280 feet (exact) 1 day= 24 hours (exact) 1 km =0.6214 miles 1 year=365.25 days 1 inch= 2.54 cm (exact) 1 hour=60 minutes (exact) 1 gallon =3.785 liters=231 in^3 1 km=1000 meters (exact) 1 slug=14.59 kg 1 foot= 12 inches 1 mile= 1609.3 m 1 parsec=3.26 light-years 1 meter=39.37 inches 1lb=0.454kg 1 cm=0.01meters=10 mm (exact) 1ft=30.48cm 1 minute= 60 seconds (exact) SCORE PROBLEM 1 (30 points) PROBLEM 2 (5 points) PROBLEM 3 (18 points) PROBLEM 4 (18 points) PROBLEM 5 (12 points) TOTAL (83 max) PERCENTAGE OUT OF 80
Ans 14m/s
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5. A 17-kg box of goodies is pulled up a frictionless hill. The angle of the hill with respect to the horizontal is 12.0º. The applied force is parallel to the direction of its displacement. Draw a picture for your benefit. Keep your final answers to 2 significant figures! a. How much work is done by gravity if the sled is pushed a distance of 25.2-m? (5 points) Ans –870J b. Calculate the magnitude of the force acting on the box of goodies if the velocity of the box is constant over the 25.2-m distance it travels? What is the concept that must be applied to solve this problem? (8 points) Ans 34N