If you are driving at 20 m/s and slam on your brakes and skid at 0.5g to a full stop, the skidding time is about
A) 3 s.
B) 4 s.
C) 5 s.
D) 6 s.
E) greater than 6 s.
Answer: B
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Suppose that a star has twice the surface temperature of the sun and also twice the radius. How many times larger is the rate at which this star emits energy compared to the rate at which the sun emits energy?
A. The star radiates at the same rate as the sun. B. 2 times C. 4 times D. 8 times E. 16 times F. 32 times T. 64 times
The stars stay in "fixed" positions on the celestial sphere because they
A) are all located at precisely the same distance from Earth. B) are so far away that our eyes don't notice their motions through space. C) remain stationary relative to our solar system in space. D) were given their names by ancient civilizations.
The figure shows an equilateral triangle ABC. A positive point charge +q is located at each of the three vertices A, B, and C. Each side of the triangle is of length a. A point charge Q (that may be positive or negative) is placed at the mid-point between B and C.
Three long, straight, parallel wires each carry a current of 10 A in the positive x direction. If the distance between each wire and the other two is 10 cm, what is the magnitude of the magnetic force on a 20-cm length of either of the wires?
a. 57 ?N b. 40 ?N c. 69 ?N d. 50 ?N e. 20 ?N