A wheel is spinning on an axle. The linear velocity of a point on the rim is simply the product of the radius times the rotational velocity, as long as the rotational velocity is measured in units of
A. deg/min.
B. rad/s.
C. deg/s.
D. rev/s.
E. rev/min.
Answer: B
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What happened during the heavy bombardment?
A) The planets of the solar system suffered many impacts. B) The planets collided with one another. C) Planetesimals collided with one another and stuck together to form planets. D) A supernova disrupted a gas cloud, causing it to start collapsing to form the solar system. E) A large meteor collided with Earth, killing the dinosaurs.
When an electron in a hydrogen atom changes its spin from the same to the opposite direction as the proton, it
A) absorbs a visible light photon. B) emits an X-ray photon. C) emits a radio wave photon. D) absorbs a radio wave photon. E) neither emits nor absorbs a photon.
Exhibit 12-1
The figure below shows a graph of angular velocity versus time for a woman bicycling around a circular track.
?
?
Use this exhibit to answer the following question(s).
Refer to . What is her angular displacement (in rad) in the first 8 minutes?
a.
0
b.
?
c.
4?
d.
8?
e.
16?
Mineral sample #2 is ________
a. Apatite - Ca5(PO4)3(F,Cl,OH) b. Corundum - Al2O3 c. Quartz - SiO2