Which of the following statements about scientific models is true?
A) A model can be used to explain and predict real phenomena.
B) All current models are correct.
C) A model tries to represent all aspects of nature.
D) A model tries to represent only one aspect of nature.
E) All models that explain nature well are correct.
A
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What is the length of time half of the Moon stays in sunlight per full rotation?
a. 29.53 days b. 27.3 days c. two weeks d. one month e. two months
A model for how repulsive forces between two particles can be mediated by a third particle would be
a. A person on a skateboard pushing against a wall. b. two people in two canoes throwing a ball back and forth. c. two people in two canoes each pulling on one end of a rope. d. two people in two skateboards giving each other a shove. e. two people in two skateboards each pulling on one end of a rope.
Transverse waves y1 = A1 sin(k1x??1t) and y2 = A2 sin(k2x??2t), with A2>A1, start at opposite ends of a long rope when t = 0. The magnitude of the maximum displacement, y, of the rope at any point is
A.
B.
C.
D.
.E.
.A vertically oriented rocket that is able to sustain a continuous upward velocity of 8 km/s will
A) eventually escape from Earth. B) be unable to escape Earth. C) maintain a fixed orbit around Earth.