A number of epochs is called a(n)
a. eon.
b. period.
c. millennia.
d. era.
b
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Spring tides occur during the new and full lunar phases
a. True b. False Indicate whether the statement is true or false
The mass density of normal air is, at a particular temperature,
If the average molecular mass of air is 29.0 u, how many air molecules are in spherical balloon of radius 15.0 cm?
A. 
B. 
C. 
D. 
E. 
F. 
Whirl a rock at the end of a string and it follows a circular path. If the string breaks, the rock tends at first to
A) continue in a circular path. B) follow a straight-line path. C) spiral inward. D) fall straight downward.
An airliner with mass 90 000 kg is flying at 900 km/h at a height of 15.0 km. What is its total energy (kinetic + potential) if the total was 0 when the airliner was at rest on the ground?
a. 5.0E+10 J b. 3.6E+10 J c. 1.3E+10 J d. zero e. 1.6E+10 J