According to the sign conventions in the book, which objects have a negative focal length?
A. Nothing has a negative focal length
B. Diverging lens and converging mirror
C. Diverging lens and diverging mirror
D. Converging lens and diverging mirror
Ans: C. Diverging lens and diverging mirror
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Suppose we looked at this image without its overlay of radio emission (that is, we looked only at the visible-light image). What features of the image would no longer be visible? Select all that apply.
A) the background galaxies B) the central galaxy C) the jets D) the lobes
In the Drake equation (Number of Civilizations = NHP × flife × fciv × fnow), what do we mean by fnow?
A) the fraction of planets with civilizations at the present time (as opposed to only in the past or future) B) the fraction of planets in the galaxy on which a civilization could theoretically develop right now C) the fraction of civilizations in the universe that currently are sending messages to us D) the fraction of all species ever to exist that we currently are aware of
An airplane is flying at a speed of 2.00 102 m/s in level flight at an altitude of 8.00 102 m. A package is to be dropped from the airplane to land on a target on the ground. Ignore air resistance
(a) At what horizontal distance away from the target should the package be released so that it lands on the target? (b) In what direction relative to the horizontal will the package be traveling when it hits the ground?
What does a breeder reactor do?
a. Produces plutonium from uranium and thereby creates more nuclear fuel than it uses. b. Creates independent chain reactions that then separate from their parents and become new energy sources. c. Uses controlled rates of reaction to conserve nuclear fuel. d. Creates its own neutron bombardment beam out of the neutrons that escape from the uranium as it decays. e. Creates its own control rods out of the lead resulting from uranium decay.