The magnitude of the acceleration of an object moving in a circle at constant speed is
a. variable.
b. directly proportional to the speed squared.
c. directly proportional to the speed.
d. directly proportional to the radius of the circle squared.
b
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The expansion rate of the Universe is:
A) increasing. B) decreasing. C) constant. D) different in different directions. E) independent of time.
Tycho used his high accuracy observations to conclude that the Earth revolves around the sun
Indicate whether the statement is true or false
An extraterrestrial observer would pick up the strongest radio signals when
A) the Earth was at perihelion. B) at new or full moon. C) North America was directly in front of the observers. D) North America was either rising or setting for the observer. E) the Super Bowl is on.
A boulder rolls off of a very high cliff and experiences no significant air resistance. While it is falling, its trajectory is never truly vertical
A) True B) False