A rock is dropped from a vertical cliff. The rock takes 7.00 s to reach the ground below the cliff. What is the height of the cliff?
A) 80.1 m
B) 240 m
C) 100 m
D) 26.2 m
E) 481 m
B
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Which statement regarding the mix of state revenues is FALSE?
a. The 50 states combined had over $1.6 trillion annual revenue in 2011.
b. Over 70 percent of all stategenerated (or "own source") revenues come from taxation.
c. Most revenue from direct charges for public services is in the form of tuition for higher education.
d. With few exceptions, states generate nearly all of their tax revenues from the general sales tax.
Before about 4 billion years ago the universe was:
A) radiation dominated. B) quark dominated. C) lepton dominated. D) matter dominated. E) dark energy dominated.
Consider a situation where you carry a 20-N box up a flight of stairs, raising its elevation by 5 m.After the dropped box hits the floor, its kinetic energy is converted into ____________
Fill in the blank(s) with correct word
Carbon-14 Dating: Carbon-14 decays by ?- emission. What nucleus is left after this decay?
A. carbon-13 B. carbon-14 C. carbon-15 D. nitrogen-14 E. nitrogen-15