In order to arrive at a solution to a problem, a scientist usually proposes and tests:
a. laws
b. theories
c. hypotheses
d. principles
e. facts
c
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An acorn falls from a tree. Compare its kinetic energy K, to its potential energy U
A) K increases and U decreases. B) K decreases and U decreases. C) K increases and U increases. D) K decreases and U increases. E) Cannot be determined without knowing the initial height of the acorn.
Which of the following characterizes a shield volcano?
A) It is dormant. B) It can erupt only briefly before being dragged off the hot spot. C) It sits above a hot spot in the planet's crust or mantle. D) It forms along a plate boundary. E) It cannot grow very large, for it has a very short span of eruption.
At a depth of about 1030 m in the sea the pressure has increased by 100 atmospheres (to about 107 N/m2). By how much has 1.0 m3 of water been compressed by this pressure? The bulk modulus of water is 2.3 × 109 N/m2
A) 2.3 × 10-3 m3 B) 3.3 × 10-3 m3 C) 4.3 × 10-3 m3 D) 5.3 × 10-3 m3 E) 6.3 × 10-3 m3
A ball is whirled on the end of a string in a horizontal circle at constant speed. Suddenly, the string breaks. Immediately after the string breaks, the ball will
A. have a horizontal velocity that is tangential to the circle. B. have no horizontal velocity. C. have a horizontal velocity toward the center of the circle. D. have a horizontal velocity partly in away from the center of the circle and partly tangent to the circle. E. have a horizontal velocity away from the center of the circle.