The planet's orbital period is
A) the time it takes it to rotate and have the same face toward us again.
B) the time it takes to return to the same location in the sky, relative to the Sun.
C) the time it takes for a satellite to orbit it.
D) the time it takes for it to retrograde back to the same position as we pass it.
E) the time its magnetic field takes to spin once.
B
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A _____ is composed of ionized gas trapped in a magnetic arch rising up through the photosphere and the chromosphere into the lower corona
A) chroma B) constellation C) nebula D) prominence
Which of the following is not true?
a. 2500 years ago people believed that earth is a sphere b. galileo discovered the phases of the moon c. edmund halley was the first to discover halley's comet d. le verrier predicted neptune without using a telescope e. Eris is larger than Pluto
Suppose that we wish to find the "net force" on an automobile, in order to apply Newton's law of motion to the motion of the automobile
As part of the net force, do we need to include "internal frictional forces" due to internal gears, bearings, etc.? A) Yes, because of Newton's law of force pairs. B) No, because only external forces need to be included. C) Yes, because every internal and external force must be included. D) No, because only the drive force needs to be included. E) Yes, because these forces dissipate some of the car's energy.
Which interacts more with high-frequency sounds?
A) large bells B) small bells C) both the same