If heat death results in a maximum amount of entropy, then what does this say about entropy at the beginning of the universe?
A) Entropy at the beginning of the universe must also have been at a maximum.
B) There was a change in the direction of entropy flow about 7 billion years ago.
C) The Big Bang was a moment of minimal entropy.
D) Nothing.
Answer: C
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The decay constant of radon is 0.181 day s-1. A sample of radon contains 6.00 × 108 radon atoms. How many atoms are left after 10.0 days?
A) 9.82 × 107 B) 7.67 × 107 C) 8.34 × 108 D) 7.29 × 108 E) 8.56 × 108
If you exert 6 N across a distance of 2 m in 3 s you'll deliver a power of
A) 1 W. B) 3 W. C) 4 W. D) 6 W. E) more than 6 W
Consider the following controls in an automobile: gas pedal, brake, steering wheel. The controls in this list that cause an acceleration of the car are
1.all three controls. 2.the gas pedal and the brake. 3.only the brake. 4.only the gas pedal.
Vision Problems: A machinist with normal vision has a near point at 25 cm. This machinist wears +4.25-diopter eyeglasses in order to do very close work. With these eyeglasses, what is the near point of the machinist? Assume that he wears the glasses extremely close to his eyes.
A. 12 cm B. 10 cm C. 7 cm D. 15 cm E. 17 cm