A 30.0 cm wrench is used to generate a torque at a bolt. A force of 40 N is applied perpendicularly at the end of the wrench. The torque generated at the bolt is
A. 5.0 N•m.
B. 7.0 N•m.
C. 9.0 N•m.
D. 12 N•m.
E. 20 N•m.
D. 12 N•m.
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Briefly describe two key pieces of evidence that support the Big Bang theory.
What will be an ideal response?
Secondary wavelets spread from a wave with
A) reduced speed. B) an unchanging speed. C) an increased speed. D) none of the above
Suppose a power plant uses a Carnot engine to generate electricity, using the atmosphere at 300 K as the low-temperature reservoir. Suppose the power plant produces 1 × 10^6 J of electricity with the hot reservoir at 500 K during Day One and then produces 1 × 10^6 J of electricity with the hot reservoir at 600 K during Day Two. The thermal pollution was
a. greatest on Day One. b. greatest on Day Two. c. the same on both days. d. zero on both days.
As we look at larger and larger scales in the universe, we find:
A) smaller and smaller masses. B) almost exclusively visible matter. C) a larger and larger percentage of the matter is visible. D) a larger and larger percentage of the matter is dark. E) an equal amount of visible and dark matter.