Which of the first units given below can be units for angular acceleration while the second units can be units for angular velocity?
a. rev/min2, m/s b. deg/hour, rev/minute
c. rad/s2, deg/hour d. rad/s, rad/s2
c
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People can snorkel down to a depth of roughly one meter. This means that the additional pressure on the air in their lungs is roughly
a. 9 800 N. b. 9 800 Pa. c. 9 800 ATM. d. 19 600 N. e. 19 600 N/m2.
Explain how the age of a rock can be determined by radiometric dating
What will be an ideal response?
In the Drake equation (Number of Civilizations = NHP × flife × fciv × fnow), what do we mean by fnow?
A) the fraction of planets with civilizations at the present time (as opposed to only in the past or future) B) the fraction of planets in the galaxy on which a civilization could theoretically develop right now C) the fraction of civilizations in the universe that currently are sending messages to us D) the fraction of all species ever to exist that we currently are aware of
The sound of a bird singing is given as 5 dB. What is the intensity of the sound of a bird singing?
a. 
b. 
c. 
d. 
e. 