When an apple falls to the ground, momentum is transferred to the ground. The momentum absorbed by the ground is
A) negligible compared to the momentum of the apple.
B) greater if the apple bounces.
C) greater than that of the apple whether or not bouncing occurs.
D) none of the above
Answer: B
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A Carnot engine runs between a hot reservoir at Th and a cold reservoir at Tc. If one of the temperatures is either increased or decreased by 3.5 K, which of the following changes would increase the efficiency by the greatest amount?
a. increasing Th b. increasing Tc c. decreasing Tc d. cannot be determined from information given
Transformers: The primary of an ideal transformer has 100 turns and its secondary has 200 turns. Neglecting frictional losses, if the power input to the primary is 100 W, we can expect the power output of the secondary to be
A. 50 W. B. 100 W. C. 200 W. D. none of the given answers.
The feel of a website is the combination of design aspects.
Answer the following statement true (T) or false (F)
When should we next expect to observe a transit of the Sun by Mars?
A) Never B) 2035 C) 2030 D) 2148