The charge of an electron is
a. positive
b. negative
c. electrons have no charge
Ans: b. negative
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A. 20 V/m B. 14 V/m C. 10 V/m D. 7.1 V/m E. 5.0 V/m
In a head-on automobile collision, a person's momentum could be reduced from 2000 kg m/s to zero in just 0.1 s. If this occurs, the average force exerted to stop the person is
A. 2,000 N. B. 20,000 N. C. 200 N. D. This can't be answered without knowing the person's mass
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The side mirror on a car is convex and has a radius of curvature of 25 cm. Another car is following, 20 m behind the mirror. If the height of the car is 1.6 m, how tall is the image?
A) 5 cm B) 2 cm C) 4 cm D) 3 cm E) 1 cm