The _____ is an imaginary sphere of very large radius surrounding Earth to which the planets, stars, Sun, and Moon seem to be attached
A) galactic sphere
B) celestial sphere
C) equatorial sphere
D) lunar sphere
B
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A particle moves at a constant speed in a circular path with a radius of 2.06 cm. If the particle makes four revolutions each second, what is the magnitude of its acceleration?
a. 20 m/s2 b. 18 m/s2 c. 13 m/s2 d. 15 m/s2 e. 24 m/s2
When the first law of thermodynamics is applied to an ideal gas that is taken through an isothermal process
A. 
B. W = 0.
C. Q = 0.
D. none of the above.
One of the most efficient engines built so far has the following characteristics: combustion chamber temperature = 1900°C; exhaust temperature = 430°C. 7.0 × 109 cal of fuel produces 1.4 × 1010 J of work in one hour
What is the power output, in hp, of this engine?
Of all the planets, only ________ has surface features easily seen from Earth with ground-based telescopes
Fill in the blank(s) with correct word