In expressions like ?v and ?t, ? stands for _________
Fill in the blank(s) with correct word
change in
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The EM wave that has the lowest frequency in this list is
a. ultraviolet. b. infrared. c. x-rays. d. microwave. e. gamma rays.
The half-life of a radioactive material is 4.5 days. How many days are required for a sample, with an initial activity of 1.0 × 105 Bq, to decay to an activity of 100 Bq?
A) 45 days B) 36 days C) 54 days D) 31 days
A refrigerator transfers heat from a colder body to a hotter body while energy is used to operate the device. This is
A. impossible unless the refrigerator uses a Carnot cycle. B. allowed only if the internal energy of the refrigerator increases. C. consistent with Clausius's statement of the second law. D. possible if entropy of the contents of the refrigerator increases.
The figure is a graph of 
for a car. Solve graphically for the distance traveled from t = 10 s to t = 15 s.
A. 75 m
B. 70 m
C. 67 m
D. 69 m