The electric potential at a distance of 4 m from a certain point charge is 200 V relative to infinity. What is the potential (relative to infinity) at a distance of 2 m from the same charge?
A) 200 V
B) 50 V
C) 400 V
D) 100 V
E) 600 V
C
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A 0.20-km wide river has a uniform flow speed of 3.0 m/s toward the east. A boat with a speed of 8.0 m/s relative to the water leaves the south bank and heads in such a way that it crosses to a point directly north of its departure point. How long does it take the boat to cross the river?
a. 29 s b. 23 s c. 25 s d. 27 s e. 17 s
The helium atom has one more electron than hydrogen. The chemical properties differ because helium
A. and hydrogen are equally reactive since chemical bonding has nothing to do with the number of electrons. B. has neutrons in the nucleus. C. is much less reactive, since its two electrons form a stable closed shell. D. is more reactive, since it has two electrons that can form chemical bonds.
_____ is an example of a Terrestrial planet
A) Jupiter B) Saturn C) Mars D) Neptune
In the Orion constellation are stars Rigel, a blue supergiant, and Betelgeuse, a red supergiant. Which star has a greater surface temperature?
A. Rigel B. Betelgeuse C. They have the same surface temperature. D. There is not enough information to tell.