Power is defined as ________
a. the energy used times the time
b. the work done times the distance of motion
c. the energy used divided by the work
d. the rate of converting energy
e. the ability to do work
d
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Sometimes, when a theory has been refined, tested, and confirmed so often that scientists have great confidence in it, it is called__________
A) parallax B) a hypothesis C) a natural law D) a model
An object 20-cm high is placed 50.0 cm in front of a lens whose focal length is 5.00 cm. Where will the image be located (in cm)?
a. 5.13 b. 5.56 c. 5.72 d. 5.93 e. 4.55
How does the mass of Jupiter compare to the rest of the planets in the Solar System?
A. Jupiter's mass is about equal to the sum of the terrestrial planet masses. B. Jupiter's mass is about equal to the sum of Uranus and Neptune's masses. C. Jupiter and Saturn have comparable masses. D. Jupiter's mass is greater than all the other planet masses combined.
How is a larger star like an SUV, while a smaller star like a fuel efficient hybrid vehicle?
A) The larger the star, the faster it burns fuel. B) The larger the star, the more likely it is to explode. C) The larger the star, the shorter its life span. D) Larger stars have only one source of energy.