Why do we call it the "periodic" table of the elements?
a. Because it was discovered in cycles, or periods.
b. Because it was rediscovered repeatedly at different times in history.
c. Because the properties of elements roughly repeat in each column.
d. Because atomic weights increase across a row from left to right.
e. Because it is updated periodically.
c
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Suppose there are 3 molecules in a container. If each molecule has a 1-in-2 chance of being in the left half of the container, what is the probability that there are exactly 2 molecules in the left half of the container?
A. 1/2 B. 1/3 C. 1/8 D. 3/8 E. 3/5
Compared to our own Galaxy, elliptical galaxies
A) have bluer stars. B) show more internal structure. C) have no arms, but a better defined disk. D) have more dust. E) show no evidence of ongoing star formation.
A weightless spring of force constant 2.50 N/cm is 15.0 cm long when nothing is attached to it. It is now used to pull horizontally on a 12.5 kg box on a smooth horizontal floor
You observe that the box starts from rest and moves 96.0 cm during the first 1.60 s of its motion. How long is the spring during this motion?
(a) In an ac circuit, if the peak value of the voltage is 100 V, what is the rms value of the voltage?
A. 141 V B) 100 V C) 210 V D) 71 V E) 120 V (b) In an ac circuit, if the rms value of the current is 100 mA, what is the peak value of the current? A. 141 mA B) 100 mA C) 210 mA D) 71 mA E) 120 mA