Conceptual Physics Ch 9 Test Questions and Answers

Conceptual Physics Ch 9 Test Questions and Answers Newton's most celebrated synthesis was and is of A) earthly and heavenly laws. B) weight on Earth and weightlessness in outer space. C) masses and distances. D) the paths of tossed rocks and the paths of satellites - Answer-A) earthly and heavenly laws. Universal Law of Gravity - Answer-Force ~ mass1 x mass2 / distance Universal Gravitational Constant, G - Answer-F = G (m1 x m2 /distance) G = 6.67E x 10^-11 Nm2/kg2 Mass of Earth - Answer-6.67E x 10^24 kg The universal gravitational constant, G, which links force to mass and distance, is similar to the familiar constant A.) pie B) g. C) acceleration due to gravity. D) speed of uniform motion. - Answer-A.) pie Inverse-Square Law - Answer-intensity = 1/distance2 The force of gravity between two planets depends on their A) masses and distance apart. B) planetary atmospheres. C) rotational motions. D) All of the above. - Answer-A) masses and distance apart. If the masses of two planets are each somehow doubled, the force of gravity between them A) doubles. B) quadruples. C) reduces by half. D) reduces by one-quarter. - Answer-B) quadruples. If the mass of one planet is somehow doubled, the force of gravity between it and a neighboring planet A) doubles. B) quadruples C) reduces by half. D) reduces by one-quarter. - Answer-A) doubles. When an elevator accelerates upward, your weight reading on a scale is A) greater. B) less. C) zero. D) the normal weight. - Answer-A) greater. When an elevator accelerates downward, your weight reading is A) greater. B) less. C) zero. D) the normal weight. - Answer-B) less. When the elevator cable breaks, the elevator falls freely, so your weight reading is A) greater. B) less. C) zero. D) the normal weight. - Answer-C) zero. If you weigh yourself in an elevator, you'll weigh more when the elevator A) moves upward. B) moves downward. C) accelerates upward. D) All of the above. - Answer-C) accelerates upward. Einstein's Theory of Gravitation - Answer-Gravitational field is a warping of space-time by a planet What would happen to Earth if the Sun became a black hole? A.) It would break away from the attraction of the Sun. B) It would be pulled into the Sun. C) It would become a black hole too. D) None of the above. - Answer-D) None of the above.