Terrestrials are small, rocky, and dense
a. True
b. False
Indicate whether the statement is true or false
True
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The yearly motion of celestial objects in the sky is caused by
A) the rotation of our planet about its axis. B) the revolution of our planet around the Sun. C) the movement of our planet within the Milky Way. D) the tilt of Earth's axis.
The Eiffel tower in Paris is made primarily of iron, whose coefficient of linear expansion is about 10 × 10^-6/°C. On a cold day when the temperature is –10°C the Eiffel tower is 300 meters tall. Its height on a hot day when the temperature is 40°C is
a. 300.0015 m b. 300.015 m c. 300.15 m d. 301.5 m e. 315 m
First Law of Thermodynamics: The gas in a perfectly insulated but flexible container does work at a rate of 13 W. At what rate is the internal (thermal) energy of the gas changing?
A. -13 W B. 13 W C. 0 W D. 6.5 W
Which of the following statements about circumpolar stars is true at all latitudes?
A) They are the stars close to the north celestial pole.
B) They always remain above your horizon.
C) They make relatively small circles, traveling clockwise around the north celestial pole.
D) Like all other stars, they rise in the east and set in the west.
E) You cannot see them from the Southern Hemisphere.