When a current flows through an ionic liquid such as salty water, the moving charges are
A) only protons.
B) only positive ions.
C) only negative ions.
D) only electrons.
E) both positive and negative ions.
E
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When a gas is heated and becomes a plasma, its electric charge is usually
A) balanced. B) negative. C) positive. D) non-existent. E) none of these
Carol is going away from you at 75 km/hr, and Sam is going in the opposite direction away from you at 90 km/hr. According to Carol, how fast is Sam going?
A) Carol sees Sam going away from her at 75 km/hr. B) Carol sees Sam going away from her at 90 km/hr. C) Carol sees Sam going away from her at 15 km/hr. D) Carol sees Sam going away from her at 165 km/hr. E) Carol sees Sam coming toward her at 15 km/hr.
For a satellite in orbit around Earth, the product of its speed times the distance from the center of Earth has the same value when the satellite is at the perigee, its closest approach to Earth, and at the apogee, its furthest point from Earth
Is the product the same at other points on the orbit? Why?
What is the voltage drop across a 5.0-? resistor if the current through it is 5.0 A?
A) 100 V B) 25 V C) 4.0 V D) 1.0 V