A student standing on a freely spinnable platform is at rest and holding up a counterclockwise spinning gyroscope as in the picture. If the student suddenly flips the gyroscope upside down, what will happen to them on the platform?

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Which of the following situations is impossible? a) an object has velocity directed east and acceleration directed east. b) an object has zero velocity but non-zero acceleration. c) an object has constant non-zero velocity and changing acceleration. d) an object has velocity directed east and acceleration directed west. e) an object has constant non-zero acceleration and changing velocity.

Select the three ways that the parallel-plate capacitor differs from a car battery.