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

Physics & Space Science

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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.

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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.

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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

Physics & Space Science

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

Physics & Space Science