When an acrobat hangs motionless from a pair of rings
a. she has no measurable weight.
b. her weight depends on the angles the ropes make with the ceiling.
c. her weight is reduced by the upward force the rings exert on her.
d. her weight is increased by the upward force the rings exert on her.
e. she exerts a gravitational force on the Earth that is equal to the sum of the forces the rings exert on her.
e
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The _____________ is 18 years and 11 1/3 days long
a. sidereal period b. synodic period c. eclipse season d. saros cycle e. eclipse year
Fossil evidence points to the presence of life on Earth as far back as ________ ago.
A) almost 4 billion years B) about 2.0 billion years C) about 545 million years D) about 65 million years
A tube open at one end and closed at the other end produces sound having a fundamental frequency of 350 Hz. If you now open the closed end, the fundamental frequency becomes
A) 87.5 Hz. B) 175 Hz. C) 350 Hz. D) 700 Hz. E) 1400 Hz.
Maximum specific humidity is an ideal way to express capacity, because specific humidity
A) does not change as air expands or contracts. B) is a mass measurement—grams/kilograms. C) is the mass of water vapor per volume of air. D) is the pressure exerted by water vapor.