The pressure on the lower surface of the cylinder is 20 kPa. If the variation of pressure in the vertical direction is given by ?p/?z = ?2400 Pa/m, the pressure on the upper surface is nearest:
(A) 19.52 kPa
(B) 20.48 kPa
(C) ?28.0 kPa
(D) 31.20 kPa
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When a baseball bat hits the ball, the impulse delivered to the ball is increased by
A. The impulse cannot be changed. B. rapidly stopping the bat after impact. C. letting the bat recoil upon impact. D. "follow through" on the swing, which increases contact time.
The acceleration of a body is given by the slope of a graph plotting
A. velocity versus distance travelled. B. time versus velocity. C. time versus distance travelled. D. distance travelled versus time. E. velocity versus time.
A convex lens has focal length f. If an object is placed at a distance between f and 2f from the lens on the principal axis, the image is located at a distance from the lens
A) of 2f. B) between f and 2f. C) of f. D) that is greater than 2f. E) of infinity.
Velma passes Mort at a high speed. Velma and Mort each have identical light-clocks. Mort and Velma both observe both clocks to "tick" simultaneously at 12 noon on both clocks. Mort observes that Velma's next tick occurs
A) only after the second drink. B) after his own clock ticks. C) before his own clock ticks. D) before or after or at the same time as his own tick, depending on Velma's precise speed. E) at the same time as the tick on his clock.