A large gravel truck is loosely covered with a tarpaulin. The edges of the tarp are tied down to the truck. When the truck is at rest the tarp is flat. When it cruises at highway speeds
A. fly up off the table.
B. not move at all, if you are careful to blow underneath it.
C. flatten down on the table.
C. flatten down on the table.
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If an x-ray machine were designed to operate at two separate accelerating voltages, one double the other, how would the shortest wavelength, ?min,h?, and the maximum frequency, fmax,h?, at the higher voltage compare to those (?min,lv, fmax,lv) at the lower voltage? ?min,hv/ ?min,lv = ________, fmax,hv/ fmax,lv =________:
a. 2, 2. b. 2, 1/2. c. 1/2, 2. d. 1/2, 1/2.
A professional skier reaches a speed of 39.6 m/s on a 30° ski slope. Ignoring friction, what was the minimum distance along the slope the skier would have had to travel, starting from rest?
a. 110 m c. 320 m b. 160 m d. 640 m
A charge of 40 pC is distributed on an isolated spherical conductor that has a 4.0-cm radius. Point A is 1.0 cm from the center of the conductor and point B is 5.0 cm from the center of the conductor. Determine the electric potential difference VA - VB
a. +1.8 V b. +29 V c. +27 V d. +7.2 V e. +9.0 V
Who was the one of the first scientists to suggest that Mars may be inhabited?
A) William Herschel B) Percival Lowell C) Giovanni Schiaparelli D) Angelo Secchi