Mort, who is standing on the ground, throws a ball at 20 m/s westward as measured by him. What is the ball's velocity relative to Velma, who is in a train moving eastward past Mort at 70 m/s?
A) 90 m/s westward
B) 50 m/s westward
C) 70 m/s westward
D) 50 m/s eastward
E) 90 m/s eastward
A
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In the figure, the current in a solenoid having no appreciable resistance is flowing from b to a and is decreasing at a rate of 9.6 A/s. The self-induced emf in the solenoid is found to be 8.4 V
(a) What is the self-inductance of the solenoid? (b) Which point, a or b is at higher potential? What will be an ideal response?
What can exist in the same place at the same time?
A) two large boulders B) two tiny boulders C) two waves D) all of the above E) none of the above
Convection currents in the air near a seashore are produced by
A) shifting winds. B) unequal heating of land and water. C) varying temperatures. D) none of the above
Consider a scale on which our entire Milky Way Galaxy is about the size (diameter) of a grapefruit. Which of the following best describes the size and distance of the Andromeda Galaxy on the same scale?
A) a grapefruit about 3 meters away B) a grapefruit about 3 centimeters away C) a beach ball about the length of a football field away D) a peanut about 3 centimeters away E) a grapefruit about 3 kilometers away