The most common form of lightning strike from a cloud to the ground involves negative charge moving from the cloud to the ground. Just before a lightning strike,
A. the electric field must point toward the sky.
B. the potential must be larger near the cloud.
C. there are no charges on the ground.
D. the potential energy of the electrons in the cloud must be small.
Answer: A
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Most of the mass of material that makes up a plasma is
A) electrically neutral. B) always positively charged. C) always negatively charged.
The time rate of doing work is called ______________
Fill in the blank(s) with correct word
A spaceship approaches Earth with a speed 0.50c. A passenger in the spaceship measures his heartbeat as 70 beats per minute. What is his heartbeat rate according to an observer that is at rest relative to Earth?
A) 73 beats per minute B) 61 beats per minute C) 75 beats per minute D) 65 beats per minute E) 69 beats per minute
What is the potential difference VB ? VA when the I = 1.5 A in the circuit segment below?
a.
+22 V
b.
?22 V
c.
?38 V
d.
+38 V
e.
+2.0 V