A car starts from rest and after 6.0 seconds it has a kinetic energy of 60,000 J. How much horsepower is needed for the car to acquire this kinetic energy?
A) 6.0 hp
B) 60 hp
C) 0 hp
D) 1.3 hp
E) 13 hp
E
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The making of abundant iron nuclei is typical of:
A) planetary nebula ejection. B) the helium flash. C) all novae. D) type I supernovae. E) type II supernovae.
The spreading of white light into its spectrum is called
A) refraction. B) dispersion. C) reflection. D) demodulation. E) rainbowing.
A space station in the form of a large wheel, 120 m in diameter, rotates to provide an "artificial gravity" of 3.00 m/s2 for persons located at the outer rim. Find the rotational frequency of the wheel (in revolutions per minute) that will produce this effect
The total kinetic plus potential energy of a body
a. can be negative b. always stays constant if the body is freely falling c. always stays constant if friction is acting d. can remain constant even if the body's speed is decreasing