Specific Heat: The water flowing over Niagara Falls drops a distance of 50 m. If all the gravitational potential energy is converted to thermal energy, by what temperature does the water rise? The specific heat of water is 4186 J/kg ? K.
A. 0.10 C°
B. 0.12 C°
C. 0.37 C°
D. 0.42 C°
Answer: B
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Which of the following planets can be seen as a crescent phase from Earth?
a. Mercury b. Venus c. Mars d. Mercury and Venus e. All of the other choices are correct.
Why does the Moon appear bigger near the horizon?
A. due to refraction B. due to an optical illusion C. due to the compression produced by Earth's atmosphere D. due to reflection
What is the main potential concern regarding the creation of artificial life?
A) that they would rapidly evolve and replace existing life on Earth B) that they would be used by hostile nations to build clone armies C) that they might be the source of new diseases or toxins for which terrestrial life would have little resistance D) that they would travel on our robotic space probes and contaminate other planets
You throw a baseball straight up. Compare the sign of the work done by the gravitational force exerted by Earth on the object while the ball goes up with the sign of the work done by the same force while it goes down
A) The work is positive on the way up and positive on the way down. B) The work is positive on the way up and negative on the way down. C) The work is negative on the way up and positive on the way down. D) The work is negative on the way up and on the way down because gravity is always downward.