Radioactivity Basics: In beta-minus decay
A. a proton is emitted.
B. a neutron is emitted.
C. an electron is emitted.
D. an electron decays into another particle.
E. a proton is transformed into a neutron.
Answer: C
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A 0.30-m-radius automobile tire accelerates from rest at a constant 2.0 rad/s2 . What is the centripetal acceleration of a point on the outer edge of the tire after 5.0 s?
a. 300 m/s2 b. 33 m/s2 c. 30 m/s2 d. 3.0 m/s2
The equivalence principle says that a person in an elevator that is in freefall feels the same acceleration as
A) a person in an elevator going up with an acceleration of g. B) a person in space, far from any gravitational source accelerating at g. C) a person in an elevator going down with an acceleration of g. D) a person in space, far away from any gravitational source with no acceleration. E) a person in orbit of Earth accelerating at g upward.
Lasers are used
a. to produce holograms b. in surgery c. to measure distances between objects accurately d. in DVD and compact disc players e. all of the above
Why isn't Earth a perfect sphere?
A. Earth's magnetic field causes the equator to bulge out. B. Rotation causes the equator to bulge out. C. Rotation causes the poles to bulge out. D. Earth is perfectly round.