Determine the heat capacity (in calories/°C) of a lake containing one million gallons (approximately 4 million kilograms) of water at 15°C
a. 4 × 10^6
b. 4 × 10^9
c. 4 × 10^3
d. 1 × 10^3
e. 4 × 10^2
b
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An 8000 kg satellite is launched from the surface of the earth, and injected into outer space a long distance from the earth. The initial velocity needed to launch the satellite into outer space is 
A. 8,450 m/s. B. 9,200 m/s. C. 11,180 m/s. D. 18,900 m/s. E. 25,200 m/s.
Winter and summer differ in length on Mars because of its elliptical orbit
Indicate whether the statement is true or false
A helium-neon laser emits red light having a wavelength of 632.8 nm and a power of 1.85 mW. How many photons are emitted each second? (h = 6.63 × 10^?34 J?s, c = 3.00 × 10^8 m/s, and 1 nm = 10?9 m)
a. 5.9E+15 b. 3.7E+34 c. 5.9E+24 d. 5.9E+18 e. 1.2E+17
An asteroid has a perihelion (the orbit's closest approach to the Sun) of 1.5 AU and a period of revolution of 8.0 yr. What is its greatest distance from the Sun (its aphelion)?
a. 8.0 AU b. 6.5 AU c. 4.0 AU d. 2.5 AU