The distinction between impulse and force involves the
A) distance the force acts.
B) time the force acts.
C) difference between acceleration and velocity.
D) mass and its effect on resisting a change in momentum.
Answer: B
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What is the likely reason that we cannot find any examples of the first generation stars?
A) The first generation stars are too faint to be visible now. B) The first generation stars formed such a long time ago that the light from them has not yet had time to reach us. C) The first generation stars were all very massive and exploded as supernova. D) The first generation stars formed with only H and He and therefore have no spectral features. E) We do not know how the first generation stars were formed.
Which of the following types of data provide evidence that helps us understand the life tracks of low-mass stars?
A) H-R diagrams of globular clusters B) H-R diagrams of open clusters C) spacecraft observations of the Sun D) observing a low-mass star over many years
Which of the following best describes the image of a concave mirror when the object's distance from the mirror is less than the focal point distance?
a. virtual, upright and magnification greater than one b. real, inverted and magnification less than one c. virtual, upright and magnification less than one d. real, inverted and magnification greater than one
How long would each of the materials on the list in Table 10.1 last at the 2000 use rate assuming the reserves given in 1968 were still correct? Compare your answers to those given in Table 10.3
What will be an ideal response?