If the distance between two spherical charged objects decreases by a factor of two, then the electrical force between the objects
A. is half as big.
B. doubles.
C. increases by a factor of four.
D. decreases by a factor of four.
E. does not change.
Answer: C
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Addition by 1. Components: Three forces, 
1, 
2, and 
3, each of magnitude 70 N, all act on an object as shown in the figure. The magnitude of the resultant force acting on the object is 
A. 35 N. B. 70 N. C. 140 N. D. 210 N. E. 0 N.
According to measurements made here on Earth, the distance to Alpha Centauri is about 4 light-years. If a spaceship is traveling toward Alpha Centauri at 0.999c, How far away is Alpha Centauri according to the travelers in the ship?
A) also about 4 light-years B) very slightly more than 4 light-years C) very slightly less than 4 light-years D) quite a bit less than 4 light-years E) quite a bit more than 4 light-years
Compared to a cluster containing type O and B stars, a cluster with only type F and cooler stars will be:
A) younger. B) older. C) further away. D) more obscured by dust. E) less obscured by dust.
The discoverer of X-rays was
A) Bragg. B) von Laue. C) Fermi. D) Roentgen. E) Xavier.