What do we call it when a planet moves backward (east to west) through the stars?
A. retrograde motion
B. the Zodiac
C. prograde motion
D. regression
Answer: A
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Suppose an object is moving in a straight line at 50 miles/hr. According to Newton's first law of motion, the object will
A) continue to move in a straight line at 50 miles/hr forever, no matter what happens. B) continue to move in a straight line at 50 miles/hr until it is acted upon by a net force. C) eventually slow down and come to a stop. D) continually slow down, but never quite come to a complete stop.
Two identical cars are traveling around the same curve on a highway. One of them is moving at 60 mph, and the other is moving at 30 mph. The centripetal force acting on the car moving at 60 mph is __________ the value of the centripetal force acting on the car moving at 30 mph
a. one quarter b. one half c. the same as d. twice e. four times
According to the law of poles, like poles ______________
Fill in the blank(s) with correct word
An electrostatic precipitator uses an electric field to remove smoke from the air
Indicate whether the statement is true or false