Refer to the diagram of Racetrack X. 
Refer to the diagram of Racetrack X. It is ________ for a racer to have uniform acceleration ________ on this track.
A. possible; everywhere
B. guaranteed; at some places
C. impossible; anywhere
D. impossible; at some places
Answer: C
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An iron block of density ?Fe and of volume l3 is immersed in a fluid of density ?fluid. The block hangs from a scale which reads w as the weight. The top of the block is a height h below the surface of the fluid. The correct equation for the reading of the scale is
a. w = (?Fe ? ?fluid)ghl2. b. w = (?fluid ? ?Fe)gl3. c. w = (?Fe ? ?fluid)gl3. d. w = (?Fe + ?fluid)ghl2. e. w = (?Fe + ?fluid)gl3.
A proton moves around a circular path (radius = 2.0 mm) in a uniform 0.25-T magnetic field. What total distance does this proton travel during a 1.0-s time interval? (m = 1.67 × 10^?27 kg, q = 1.6 × 10^?19 C)
a. 82 km b. 59 km c. 71 km d. 48 km e. 7.5 km
A heavy boy and a lightweight girl are balanced on a massless seesaw. If they both move forward so that they are one-half their original distance from the pivot point, what will happen to the seesaw?
A) It is impossible to say without knowing the masses. B) It is impossible to say without knowing the distances. C) The side the boy is sitting on will tilt downward. D) Nothing, the seesaw will still be balanced. E) The side the girl is sitting on will tilt downward.
A force applied to an object will always cause the object to
a. speed up b. accelerate c. change its momentum d. all of the above e. none of the above