Is it possible for an object to have nonzero acceleration but still have the magnitude of its velocity be zero?
Yes, an object moving in a circle at constant speed is still changing its direction of
travel and thus has a centripetal acceleration.
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A big defensive lineman picks up a fumbled football and begins rumbling toward the end zone. His mass is 150 kg, and his velocity is 6.0 m/s, west. A brave wide receiver, whose mass is 90 kg, must stop that lineman and he is right in the lineman's path, so it has to be a head-on collision. How fast must the wide receiver be running if he wants to drop the lineman in his tracks and save the day?
A. 88 mph B. 10 m/s C. 0.60 m/s D. 8.3 m/s
One of the features of "pseudoscience" that distinguishes it from "science" is that pseudoscientific ideas are
A) wrong. B) unusual, or odd. C) Both of the above. D) held dogmatically. E) held tentatively, as a hypothesis.
The oldest easily identifiable fossils appear in sedimentary rocks that formed 3.4 billion years ago during the ____________________ period
Fill in the blank(s) with correct word
On a cosmic calendar, in which the history of the universe is compressed into 1 year, when did Kepler and Galileo first discover that we live on a planet in solar system
a) December 17 b)September 3 c) 1 second ago