When a 20-V emf is placed across two resistors in series, a current of 2.0 A is present in each of the resistors. When the same emf is placed across the same two resistors in parallel, the current through the emf is 10 A. What is the magnitude of the greater of the two resistances?
a. 7.2 W
b. 7.6 W
c. 6.9 W
d. 8.0 W
e. 2.8 W
A
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This graph shows the number of asteroids with different orbital periods. Notice the gap indicated by the downward-pointing black arrow. What does this graph tell us about this gap?
A) There are few if any asteroids at the indicated orbital period of about 4 years. B) There are more asteroids concentrated at the orbital period indicated by the arrow than at any other orbital period. C) Asteroids with an orbital period of about 4 years are all located very close together; so close that collisions occur frequently. D) There are exactly 495 asteroids with an orbital period of 4 years.
According to the authors of the text, the theory of relativity
A) does not violate our common sense. B) violates common sense because it contradicts logic. C) violates common sense because it is counterintuitive. D) violates common sense because the theory contradicts itself in many cases. E) violates common sense because it is full of paradoxes.
Starting from rest, a proton falls through a potential difference of 1.2 kV. What speed does it acquire?
What will be an ideal response?
Arrange the temperatures 40 ºF, 40 ºC, and 40 K from highest to lowest
a. 40 ºF, 40 ºC, 40 K b. 40 ºC, 40 K, 40 ºF c. 40 ºF, 40 K, 40 ºC d. 40 ºC, 40 ºF, 40 K