When one travels east while passing over a time zone boundary (ignoring daylight savings time issues),
a. the date is decreased one day.
b. the time is decreased one hour.
c. the time is advanced one hour.
d. the date is advanced one day.
e. none of these occurs.
c
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Answer: C
A) have lots of vertical development. B) take a billowy and towering form. C) spread out into horizontal layers. D) evaporate quickly.
Two objects are dropped from a bridge, an interval of 1.0 s apart, and experience no appreciable air resistance. As time progresses, the DIFFERENCE in their speeds
A) increases. B) remains constant. C) decreases. D) increases at first, but then stays constant. E) decreases at first, but then stays constant.
A 1.2-kg mass is projected up a rough circular track (radius = 0.80 m) as shown. The speed of the mass at point A is 8.4 m/s, and at point B, it is 5.6 m/s. What is the change in mechanical energy between A and B caused by the force of friction?
A. ?2.7 J B. ?8.8 J C. ?4.7 J D. ?6.7 J E. ?19 J
Huygens' principle applies mainly to
A) refraction of waves in a medium. B) reflection of waves. C) both of these D) neither of these