If a substance is radioactive it is definitely
a. dangerous.
b. emitting alpha particles.
c. glowing.
d. useful.
e. all of the above.
f. none of the above
Indicate whether the statement is true or false
f
RATIONALE: Some choices are possible in certain cases but not in all cases.
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A engine manufacturer makes the claim that the engine they have developed will, on each cycle, take 100 J of heat out of boiling water at 100°C, do mechanical work of 80 J, and exhaust 20 J of heat at 10°C
What, if anything, is wrong with this claim? A) The heat exhausted must always be greater than the work done according to the second law of thermodynamics. B) This engine violates the first law of thermodynamics because 100 J + 20 J ? 80 J C) An engine would operate by taking in heat at the lower temperature and exhausting heat at the higher temperature. D) The efficiency of this engine is greater than the ideal Carnot cycle efficiency. E) There is nothing wrong with this claim because 100 J = 20 J + 80 J.
The value 1.38 × 10^-23 J/K is known as:
a. the universal gas constant. c. Avogadro's number. b. Boltzmann's constant. d. the molar specific.
After seven half-lives have elapsed, what fraction of the original amount has changed into another element?
a. 6/7 b. 13/14 c. 127/128 d. None of these
Exhibit 11-1
Two birds of prey hurtling after the same mouse collide in mid-air and grab each other with their talons. Each 250-g bird is flying at 30 m/s at a 60° angle to the ground.
?
?
Use this exhibit to answer the following question(s).
Refer to Exhibit 11-1. What is the horizontal component of their momentum, in 
, immediately after the collision?
A. 0 B. 6.1 C. 7.5 D. 13 E. 15