How many calories of heat are required to raise the temperature of 4 kg of water from 50°F to the boiling point?
a. 6.5 × 10^5
b. 3.6 × 10^5
c. 15 × 10^5
d. 360
e. 4 × 10^4
b
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The rings of Saturn consist primarily of ________.
A. methane and ammonia B. water ice C. hydrogen and helium D. silicate rocks
An ideal gas is allowed to expand slowly. The system is thermally isolated. Which statement regarding the final pressure is true?
Gravitational Force: As a 70-kg person stands at the seashore gazing at the tides (which are caused by the Moon), how large is the gravitational force on that person due to the Moon? The mass of the Moon is 7.35 × 1022 kg, the distance to the Moon is 3.82 × 108 m, and G = 6.67 × 10-11 N ? m2/kg2.
A. 0.24 N B. 0.024 N C. 0.0024 N D. 0.00024 N
The radius of a circle is tripled. By what factor is the area changed?
A. 3 B. 6 C. 9 D. 12