A polar bear starts at the North Pole. It travels 1.0 km south, then 1.0 km east, and then 1.0 km north to return to its starting point. This trip takes 45 min. What was the bear's average speed?
A) 0.00 km/h
B) 0.067 km/h
C) 4.0 km/h
D) 5.3 km/h
C
Physics & Space Science
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A net force acting on an object will always cause a change in the object's
A) momentum. B) speed. C) mass. D) direction.
Physics & Space Science
According to the ages of the globular clusters, our Galaxy is about ________ times as old as the solar system
Fill in the blank(s) with correct word
Physics & Space Science
What gas is the primary constituent of our atmosphere?
A) oxygen B) carbon dioxide C) nitrogen D) hydrogen E) helium
Physics & Space Science
An ore car of mass 4 900 kg rolls downhill on tracks from a mine. At the end of the tracks, 13.5 m lower in elevation, is a spring with k = 410 000 N/m. How much is the spring compressed in stopping the ore car? Ignore friction
a. 1.26 m b. 0.889 m c. 1.78 m d. 0.568 m e. 0.484 m
Physics & Space Science