A space probe in remote outer space continues moving
A) because some kind of force acts on it.
B) in a curved path.
C) even though no force acts on it.
D) due to gravity.
Answer: C
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If there were no gravity, a ball thrown upward at an angle would follow a straight-line path. Due to gravity, however, at the end of 1 s it is
A) 5 m below the straight line. B) 10 m below the straight line. C) 15 m below the straight line. D) 20 m below the straight line. E) more than 20 m below the straight line.
The moons of Mars are ______________; that is, they always keep the same face toward the planet
Fill in the blank(s) with correct word
Jenny and Simone release their snowballs from the same height, at the same time and with the same speed. Simone's is thrown upward while Jenny’s is thrown downward. Which one hits the ground first (ignore air resistance)?
A. the one thrown upward B. the one thrown downward C. they hit at the same time D. it depends on the initial height
What is meant by a line spectrum?
a. a spectrum which is straight b. a spectrum made of bright lines in certain places, separated by dark gaps c. a spectrum made by a hot filament stretched into a straight line d. none of the above