An inventor claims to have designed a perpetual motion machine, a device that creates its own power. Which of the following laws best explains why a perpetual motion machine cannot work?
A) Law of conservation of energy
B) Law of conservation of matter
C) Newton's second law
D) Newton's third law
Ans: A) Law of conservation of energy
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If in a gas the opacity is high, then energy transport is by _____________
a. conduction b. convection c. radiation d. All of the other choices are correct.
An ant travels 30 cm east, 25 cm north, and finally 15 cm west. What is the direction with respect to its starting point?
A. 59
N of E
B. 
N of E
C. 
N of E
D. 
N of W
E. 
N of E
The Earth's oceans evolved
A) from condensation of water vapor in a hydrogen-oxygen rich atmosphere. B) from condensation of water vapor from volcanic eruptions. C) with accumulation of rainfall. D) as Earth warmed.
Which type of weather is characterized by spiral storms with winds of up to 300 km/hour?
A) hurricanes B) tornadoes C) tropical depressions D) tropical storms