A speed boat requires 80 kW to move at a constant speed of 12 m/s. What is the resistive force of the water at this speed?
a. 2700 N
c. 6700 N
b. 5300 N
d. 7700 N
C
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Which was a contribution to astronomy made by Copernicus?
A) The planets move around the Sun in elliptical orbits. B) His theory of gravity accounted for the variable speeds of the planets. C) He laid out the order and relative motion of the known solar system. D) He discovered the Sun was not at the center of the Milky Way. E) His telescope revealed the four moons of Jupiter, a model solar system.
The reason that you would use a ramp to carry a weight to the top of a platform, rather than lifting it up a ladder, is because the
a. force exerted would be less b. work done would be less c. power expended would be less d. gain in potential energy would be more
Relate a nova and a Type I supernova
What will be an ideal response?
If an electric charge is shaken up and down frequently enough
A) sound can be emitted. B) light can be emitted. C) both of these D) neither of these