Tides occur later each day because of
a. Earth's rotation with respect to the Sun.
b. the Moon's rotation with respect to Earth.
c. Earth's rotation with respect to the Moon.
d. a change in gravitational attraction.
c
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The star Betelgeuse appears red; the star Rigel appears blue. What accounts for this difference? a. Betelgeuse and Rigel have different chemical compositions
b. Betelgeuse is moving away from Earth, Rigel is moving toward Earth. c. Betelgeuse is moving toward Earth, Rigel is moving away from Earth. d. The surface of Betelgeuse is hotter than the surface of Rigel. e. The surface of Betelgeuse is cooler than the surface of Rigel.
During the day, the Sun is too bright for us to see where it is located with respect to the constellations, but we can use our observations of stars at night to figure this out. Based on the way stars shift position over the course of a year, your knowledge of how the time of day is defined, and the fact that the same constellations are seen at the same place in the sky at the same time of night on a given day of the year, which of the following is most likely correct?
A. The Sun appears to move across the constellations over the course of a year, ending where it started with respect to the background stars by the end of that period. B. The Sun appears to move across the constellations over the course of a 24-hour period, ending where it started with respect to the background stars by the end of that period. C. The Sun always appears to be in front of the same constellation. D. The Sun's apparent location with respect to the constellations is random and cannot be predicted.
All the following statements are true. Which one explains why mean solar time differs from apparent solar time?
A) The length of a solar day is not always exactly 24 hours. B) Earth's rotation period is actually about 23 hours and 56 minutes, not 24 hours. C) Earth's axis precesses with a period of about 26,000 years. D) The Sun reaches the meridian at different times at different longitudes within the same time zone.
A constant net torque is applied to an object. Which one of the following will not be constant?
1.angular acceleration 2.angular velocity 3.moment of inertia 4.center of gravity