Why are lunar eclipses more commonly seen than solar eclipses?
A. Lunar eclipses occur at night and are easier to see.
B. The Moon goes around the Earth faster than the Earth goes around the Sun.
C. The tilt of the Moon's axis is smaller than the Earth's.
D. The Earth casts a bigger shadow than the Moon.
The Earth casts a bigger shadow than the Moon.
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The Sun's mass and volume are over a million times that of our Earth
Indicate whether the statement is true or false
If a car engine has a thermal efficiency of 50% and it does 500 J of work in one cycle, how much energy input does it require each cycle?
1.250 J 2.500 J 3.750 J 4.1000 J
Specific Heat: Object 1 has three times the specific heat capacity and four times the mass of Object 2. The two objects are heated from the same initial temperature, T0, to the same final temperature Tf. During this process, if Object 1 absorbs heat Q, the amount of heat absorbed by Object 2 will be
A. 12Q.
B. 6Q.
C. 
Q.
D. 
Q.
E. 
Q.
Consider the elliptical orbit of a comet around the Sun. Where in its orbit is the comet moving the fastest?
A) when it is farthest from the Sun B) when it is closest to the Sun C) It is always moving at the same speed.