Radioactive decay is involved in
a. irradiating food to destroy harmful bacteria
b. keeping the interior of the Earth hot
c. making smoke detectors work
d. finding flaws in jet engine parts
e. all of the above
E
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In order to understand star clusters, we need to be able to estimate their ages. What technique do scientists use for this?
A) radioisotope dating B) counting the planets that have formed around the largest stars C) finding the main-sequence turnoff point of the stars D) calculating orbital parameters using Kepler's Laws E) measuring its parallax
Answer the following statement(s) true (T) or false (F)
1. Initially, the light puck was moving south and the final speed of the conjoined pucks is zero. The original velocity of the heavy puck must have been northward
The internal energy of n moles of an ideal gas depends on
a. one state variable T. b. two state variables T and V. c. two state variables T and P. d. three state variables T, P and V. e. four variables R, T, P and V.
Which laws of physics, if any, distinguish between the backward and the forward direction in time?
A) None. B) The law of conservation of energy but not the second law of thermodynamics. C) The law of conservation of energy and the second law of thermodynamics. D) The second law of thermodynamics but not the law of conservation of energy. E) Newton's law of motion.