When it is summer in the Northern Hemisphere, it is ________ in the Southern Hemisphere.
A) winter
B) fall
C) spring
D) summer
A) winter
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A bullet shot straight up returns to its starting point in 10 s. What is the initial speed of the bullet?
A. 98 m/s B. 49 m/s C. 25 m/s D. 9.8 m/s
Three resistors connected in parallel have the individual voltages labeled DV1, DV2, and DV3, respectively. Which of the following expresses the total voltage DVT across the three resistors when connected in this manner?
a. DVT = (1/DV1 + 1/DV2 + 1/DV3) c. DVT = (1/DV1 + 1/DV2 + 1/DV3)-1 b. DVT = DV1 + DV2 + DV3 d. DVT = DV1 = DV2 = DV3
The axis of rotation of a top changes its direction as the top spins because:
a. the inertia of the top keeps its orientation changing. b. conservation of rotational motion keeps the direction changing if it was changing to start. c. rotational kinetic energy causes the direction to shift. d. gravitational force exerts torque on the top. e. angular momentum is conserved.