A nonconducting sphere of radius 10 cm is charged uniformly with a density of 100 nC/m3 . What is the magnitude of the potential difference between the center and a point 4.0 cm away?
a. 12 V
b. 6.8 V
c. 3.0 V
d. 4.7 V
e. 2.2 V
c
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Lenz's Law is a consequence of the law of conservation of
A) mass. B) momentum. C) electric field. D) energy. E) charge.
In order for the atoms in a neon discharge tube (or a neon beer sign) to emit their characteristic orange light, it is necessary that
A) there be no unoccupied energy levels in each atom. B) each atom carry a net electric charge. C) the atoms be continually replaced with fresh atoms, because the energy of the atoms tends to be used up with continued excitation, resulting in dimmer and dimmer light. D) electrons first be given energy to raise them from their ground state to an excited state.
In a location where the train tracks run parallel to a road, a high speed train traveling at 60 m/s passes a car traveling at 30 m/s in the opposite direction. How long does it take for the train to be 180 m away from the car?
A. 2.0 s B. 3.0 s C. 6.0 s D. 9.0 s E. 18.0 s
You feel warm from the Sun at the beach because of heat radiation
a. True b. False Indicate whether the statement is true or false