A solid conducting sphere (radius = 5.0 cm) has a charge of 0.25 nC distributed uniformly on its surface. If point A is located at the center of the sphere and point B is 15 cm from the center, what is the magnitude of the electric potential difference between these two points?
a. 23 V
b. 30 V
c. 15 V
d. 45 V
e. 60 V
b
Physics & Space Science
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Potential: A proton is accelerated from rest through a potential difference V0 and gains a speed v0. If it were accelerated instead through a potential difference of 2V0, what speed would it gain?
A. 8v0
B. 4v0
C. 2v0
D. v0
Physics & Space Science
During a very cold winter, water pipes sometimes burst because
A) the ground contracts when colder, pulling pipes apart. B) water expands when freezing. C) water contracts when freezing. D) the thawing process produces pressure on the pipes. E) none of the above
Physics & Space Science
The variables length l, gravity g, velocity V, and density ? can be combined into the dimensionless term:
Physics & Space Science
Radio waves were discovered by
A. Hertz. B. Maxwell. C. Penzias. D. Dumont. E. Marconi.
Physics & Space Science