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
Answer is b. 4 × 10^9
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When a star collapses to become a black hole, its mass
A) increases. B) decreases. C) remains unchanged.
A star near the lower right of the H-R diagram is likely to be
A) red, with high luminosity. B) red, with low luminosity. C) hot, bright, and very large. D) yellow, with luminosity similar to our Sun's. E) blue, with high luminosity.
If astronauts could travel at v = 0.90c, we on Earth would say it takes (4.2/0.90) = 4.7 years to reach Alpha Centauri, 4.2 lightyears away. The astronauts disagree. How much time passes on the astronaut's clocks?
a. 2.0 years b. 2.4 years c. 1.4 years d. 3.0 years
The electrons that make up the current in an electric circuit move by
1) interacting with the electric field established in the circuit. 2) bumping into one another in such as way as to send pulses over long distances. The drift speed of individual electrons making up the current is 3) very low, about a snail's pace. 4) about the speed of sound. 5) about the speed of light.