The horizontal speed of a projectile
a. is zero.
b. stays constant.
c. continuously increases.
d. continuously decreases.
e. sometimes decreases and sometimes increases.
b
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The diagram below shows three approximate locations of the sun along the western horizon. Which number indicates the location of the sun at sunset on the vernal equinox for an observer at a latitude of 48° S?
a. 1
b. 2
c. 3
d. The sun will set in the east for an observer in the southern hemisphere.
e. The sun will not set on vernal equinox at this latitude.
A car traveling with velocity v is decelerated by a constant acceleration of magnitude a. It travels a distance d before coming to rest. If its initial velocity were doubled, the distance required to stop would
A) double as well. B) decrease by a factor of two. C) stay the same. D) quadruple. E) decrease by a factor of four.
One day while measuring acceleration with his pulse as a timing source, Galileo became so excited that his pulse rate increased. His results for acceleration that day were probably
A. unchanged. B. higher than usual. C. lower than usual. D. more accurate than usual.
Suppose Spider-Man throws a web that is 1.00 m long with a velocity of 0.8c (? = 5/3) with respect to the Earth. What will be the length of web as observed by J. Jonah Jameson standing on the Earth?
A. 0.80 m B. 1.67 m C. 1.33 m D. 0.60 m E. 1.00 m