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# img183 - 77777 7 Water ﬂows over a section of Niagara...

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Unformatted text preview: 77777 7. Water ﬂows over a section of Niagara Falls at a rate of 1.20 x 106 kg/s and falls 50.0 In. What is the power dissipan by the waterfall due to the change in potential energy of the water? (1) 588 MW (2) 294 MW (3) 147 MW (4) 60.0 MW (5) 746 MW 8. A moderate force will break an egg. However, an egg dropped on the road usually breaks, while one dropped on the grass usually doesn’t break. This is because for the egg dropped on the grass: ' the time interval for stopping is greater. the change in momentum is less. the time interval for stopping is less. the change in momentum is greater. the grass is green. UhkCJMr—l 9. What is the angular speed about the rotational axis of the Earth for a person standing on the surface? (1) 7.3 x 10—5 rad/s (2) 3.6 X 10—5 rad/s (3) 6.28 X 10—5 rad/s (4) 3.14 X 10—5 rad/s (5) It depends on the latitude of the person . 10. A 38.0 kg child takes a ride on a Ferris wheel that rotates four times each minute and has a diameter of 16.0 In. What force does the seat exert on the child at the highest point of the ride? @319 N (2) 375 N (3) 426 N (4) 608 N (5) 980 N 11. A solid sphere of mass 4.0 kg and radius 0.12 m starts from rest at the top of a ramp inclined 15°, and rolls to the bottom. The upper end of the ramp is 1.2 In higher than the lower end. What is the linear speed of the sphere when it reaches the bottom of the ramp? (1) 4.1 m/s (2) 4.7 m/s (3) 3.4 m/s (4) 2.4 m/s (5) 5.8 m/s 12. An object with mass m and moment of inertia I is spinning with an angular momentum L. Its kinetic energy is: @0.5L2/I. (2) 0.512/L. (3) 0.5L2/7n. (4) 0512/7". (5) 0.512/L2. 13. The uniform pressure applied to all six sides of a copper cube is raised from 0 to 7.0 X 105 N / mz. What is the percentage change in volume of the cube"? (1) 0.5 x 10-30/0 (2) 0.4 x 1072% (3) 8.4 x 10-200 (4) 0.1 x 10-300 (5) 2.4 x 104% 14. What is the total mass of the Earth’s atmosphere? Assume that gravity is g = 9.80 III/5211p to the top of the atmosphere. Hint: Patmosphoric = 1.013 x 105 N/m2 (1) 5 x 1018 kg (2) 1 x 1018 kg (3) 5 x 1016 kg (4) 1 x 1020 kg (5) 5 x 1020 kg 15. As ice ﬂoats in water, about 10% of the ice ﬂoats above the surface of the water. If we ﬂoat some ice in a. glass of water7 what will happen to the water level as the ice melts? 1) The water level will remain unchanged. 2 The water level will rise. 3 The water level will rise 10% of the volume of the ice that melts. 4 The water level will become lower. 5 The water level will fall 10% of the volume of the ice that melts. ...
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