If the orbit is elliptical, rather than circular, what can be said about the work done by the Sun on Earth?
a. It does not matter whether the orbit is circular or elliptical, no work is done.
b. If the orbit is elliptical, work is done to speed up or to slow down Earth, depending on its location in orbit.
c. Whether the orbit is circular or elliptical, work must be done to propel Earth around the Sun.
d. The work the Sun does on Earth accounts for Earth's changes of season.
e. The work the Sun does on Earth causes the tides.
b
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To see a solar eclipse, you have to be in Earth's shadow
a. True b. False Indicate whether the statement is true or false
A 20-ton truck collides with a 1500-lb car and causes a lot of damage to the car. During the collision
A) the force on the truck due to the collision is slightly greater than the force on the car. B) the force of on the truck due to the collision is exactly equal to the force on the car. C) the force on the car due to the collision is much greater than the force on the truck. D) the car and the truck have the same magnitude acceleration.
Which statement best describes the status of the Copernican and Ptolemaic theories of the solar system shortly after Copernicus invented his theory [about 1550, and before Tycho]?
A) Both theories agreed with the experimental facts. B) Both theories were known to be wrong. C) Ptolemy's theory fit the experimental facts better than the Copernican theory. D) Copernicus had proved that Ptolemy's theory was incorrect. E) Although Copernicus couldn't disprove Ptolemy's theory, the Copernican theory agreed much better with the experimental facts than did the Ptolemaic theory.
Newton's Law states that no force is required to keep a moving object in motion. Why, then, do you have to pedal continuously to ride a bicycle along a flat road? ________ force
What will be an ideal response?