The plane in which almost all planets orbit the Sun is called the
A) equator of the solar system.
B) ecliptic.
C) equant.
D) node.
E) galactic plane.
B
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Carnot Engine: The "hot shot" heat engine operating between 40°C and 380°C has an efficiency that is 60% of that of an ideal Carnot engine operating between the same temperatures. If the "hot shot" engine absorbs heat at a rate of 60 kW, at what rate does it exhaust heat?
A. 36 kW B. 41 kW C. 57 kW D. 60 kW
What is the best evidence for an extremely massive black hole in the center of the Milky Way?
A) The center of our galaxy hosts a pulsar that is spinning so fast that it could only be a black hole. B) We observe stars vanishing in the center of the Galaxy as they are sucked into the black hole. C) Huge amounts of X-rays are pouring out of the center of the galaxy. D) The orbits of stars in the center of the galaxy indicate that the presence of 3 to 4 million solar mass object in a region no larger than our Solar System.
When a molecule collides with another that is approaching with greater momentum, its rebound speed
1) stays the same, 2) increases, 3) decreases, and when a molecule collides with another that is receding, its rebound speed 4) stays the same. 5) increases. 6) decreases.
The effects of scaling are beneficial to swimmers in a race who are relatively
A) large. B) small. C) neither of these