The elapsed time between two successive crossings of the same meridian by the Sun is known as ______________ day
a. one sidereal
b. an apparent solar
c. a 24-hour
d. a mean solar
a
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Venus has a higher average surface temperature than Mercury. Why?
A) because its surface is covered with hot lava from numerous active volcanoes B) because its slow rotation gives it more time to heat up in sunlight C) because it is closer to the Sun D) because its surface is heated by an extreme greenhouse effect
Why do almost all active galaxies occur in clusters of galaxies?
What will be an ideal response?
Gravity acts over a limited distance range
Indicate whether the statement is true or false
A 40-kg crate is being lowered with a downward acceleration is 2.0 m/s2 by means of a rope
(a) What is the magnitude of the force exerted by the rope on the crate? (b) What would be the magnitude of the force exerted by the rope if the crate were being raised with an acceleration of 2.0 m/s2?