A circuit breaker often serves the same purpose as a
A) battery
B) fuse.
C) capacitor.
D) all of the above
E) none of the above
Answer: B
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When an object is effectively isolated from external torques, like an ice skater twirling on the tip of one skate, the angular momentum of the object
a. can be increased by shifting mass out away from the axis of rotation. b. can be decreased by shifting mass out away from the axis of rotation. c. can be increased by shifting mass in toward the axis of rotation. d. can be decreased by shifting mass in toward the axis of rotation. e. cannot be changed except by friction at the point of contact.
What is the wavelength of a 2.0-GeV electron?
A) 1.2 fm B) 0.62 fm C) 0.099 fm D) less than 10-18 m E) 2 fm
Why is Venus so much hotter than Earth?
A) Venus has significant amounts of carbon dioxide in its atmosphere. B) Venus is more massive. C) Venus rotates more slowly. D) Venus was formed before the Earth was. E) Venus is closer to the Sun.
What is the Kuiper Belt?
A. an enormous aggregate of gas and dust from which the Solar System was formed B. a large belt containing asteroids in a gap between the orbits of Mars and Jupiter C. a swarm of comet nuclei in a huge shell surrounding the Sun and planets D. a disklike swarm of icy objects that lies from near the orbit of Neptune to past Pluto's orbit