The phase of the Moon at the time of solar eclipse is
What will be an ideal response?
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Black holes, by definition, cannot be observed directly. What observational evidence do scientists have of their existence?
A) Theoretical models predict their existence. B) Gravitational interaction with other objects. C) Space is, overall, very black. D) We have sent spacecraft to nearby black holes. E) We have detected neutrinos from them.
Percival Lowell’s claims of a Martian civilization generated great public interest, but other scientists of his time were highly skeptical of these claims. Which two of the following statements (which are all true) explain why other scientists of the late 19th and early 20th centuries rejected Lowell’s claims?
a. Lowell’s canals did not appear in photographs of Mars taken through telescopes. b. Lowell’s canals followed perfectly straight lines for thousands of kilometers. c. Mars has an axis tilt very similar to Earth’s axis tilt. d. Like Earth, Mars has polar ice caps. e. Mars rotates with a period only a little longer than Earth’s rotation period.
A 5.0-kg object is pulled along a horizontal surface at a constant speed by a 15-N force acting 20° above the horizontal. How much work is done by this force as the object moves 6.0 m?
a. 78 J b. 82 J c. 85 J d. 74 J e. 43 J
What is another simple way to describe the weight of an object?
a. The mass of that object. b. The mass of that object at an acceleration of 1 m/s2. c. The magnitude of the force attracting it toward Earth's surface. d. The height of that object. e. The acceleration of that object.