In a relay race, runner A is carrying the baton and has a speed of 2.8 m/s. When he is 25 m behind the starting line, runner B starts from rest and accelerates at 0.080 m/s2. How fast is B traveling when A overtakes her?
A) 0.10 m/s
B) 0.33 m/s
C) 0.84 m/s
D) 2.0 m/s
E) Runner A never catches up.
C
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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.
Which of the following is TRUE?
a) The average surface temperature of Venus is about 30 degrees Fahrenheit. b) Mercury has a very thick atmosphere made mostly of carbon dioxide. c) The runaway greenhouse effect causes the present temperatures on Mars to exceed thoseon Earth. d) Mercury rotates exactly one and a half times for every one revolution around the Sun. e) Venus has no volcanos on its surface.
An 8.0 kg object moving with an initial velocity of 8.0 m/s on a surface comes to rest due to friction after it travels a horizontal distance of 10 m
What is the coefficient of kinetic friction between the object and the surface? Use g = 10 m/s2. A) 0.13 B) 0.25 C) 0.32 D) 0.43 E) 0.80
The gap between electrodes in a spark plug is 0.06 cm. In order to produce an electric spark in a gasoline-air mixture, the electric field must reach a value of 3 × 10^6 V/m. What minimum voltage must be supplied by the ignition circuit when starting the car?