Why are elements with even numbers of protons more abundant, on average, than elements with odd numbers of protons?
A) because when elements split in a fission reaction, they prefer to split with all the protons paired
B) because elements are mainly made in fusion reactions with hydrogen nuclei
C) because elements are mainly made in fusion reactions with helium nuclei
D) There's no explanation; it's something of a mystery to be explained or it may be a coincidence.
C
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A rock sample contains 1/2 microgram of the parent radioactive isotope U-235 and 1/2 microgram of its daughter isotope Pb-207. If the half-life of this decay is 700 million years, how old is this rock?
A) 1400 million years B) 2100 million years C) 700 million years D) 350 million years
Lillian pulls on a 10-kg wagon with a constant force of 30 N. What is the wagon's acceleration?
A) 0.3 m/s2 B) 3.0 m/s2 C) 10 m/s2 D) 30 m/s2 E) 300 m/s2
A transformer can only operate if _________
a. the power in equals the power out b. the potential difference is large enough c. a.c. is used d. we step up the voltage
Which of these undergoes circular motion?
a. A bullet shot from a gun. b. A top spinning on a table. c. A baseball hit by a bat. d. A satellite orbiting the Earth. e. An apple falling out of a tree.