Do you think it is possible that a 10-solar-mass main-sequence star could harbor an advanced civilization? Explain your reasoning
What will be an ideal response?
A 10-solar-mass star has a very short lifetime. It also produces copious amounts of ultraviolet radiation, which may damage living organisms.
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Series/Parallel Circuits: What is the magnitude of the potential difference between points B and C for the circuit shown in the figure? The battery is ideal, and all the numbers are accurate to two significant figures.
A. 6.0 V B. 4.0 V C. 3.0 V D. 2.0 V
Which of the following best describes why the smaller terrestrial worlds have cooler interiors than the larger ones?
A) They were cooler when they formed. B) The smaller ones are farther from the Sun. C) They have relatively fewer radioactive elements. D) They have relatively more surface area compared to their volumes. E) They had more volcanic eruptions in the past, which released their internal heat.
Which of the following statements about Kepler's laws is false?
A) Kepler's laws provide mathematical descriptions of the motion of the planets. B) Kepler's first law states that planetary orbits are shaped as ellipses. C) Kepler's second law implies that when planets are closer to the sun, they move faster. D) Kepler's laws explain why planets with larger semi-major axes have much longer orbital periods.
A heat engine that would take in 1000 J of heat from a reservoir at 500 K and exhaust 500 J to a reservoir at 300 K, converting the other 500 J of heat to work, is
A. thermodynamically possible. B. not thermodynamically possible. C. possible only for a Carnot cycle.