Which planet moves the fastest?
a. Earth
b. Mars
c. Venus
d. Mercury
d
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If you began at rest and ended at rest and the average speed of your trip was 10 kph, that means:
a. for most of the trip, you were going 10 kph. b. sometimes you were going faster than 10 kph. c. 10 kph was the fastest you ever went. d. 10 kph was the slowest you ever went. e. you traveled at constant speed throughout the trip.
Wien's Law: What is the wavelength of the most intense light emitted by a giant star of surface temperature 5000 K? The constant in Wien's law is 0.00290 m ? K.
A. 576 nm B. 578 nm C. 580 nm D. 582 nm
The observation that there are asteroids made entirely of rock or entirely of iron suggests that ________.
A. large planetesimals formed entirely out of the same material B. these asteroids were formed from volcanic eruptions on early planets C. asteroids made of both rock and iron are particularly fragile and are easily destroyed D. the early Solar System had intermediate-sized differentiated planetesimals
Engines, including car engines, are rated in horsepower. What is horsepower?
(a) The force needed to start the engine. (b) The force needed to keep the engine running at a steady rate. (c) The energy the engine needs to obtain from gasoline or some other source. (d) The rate at which the engine can do work. (e) The amount of work the engine can perform