How can a neutron probe split a nucleus?
a. By striking it at just the right point so it breaks in half.
b. By disturbing the strong force so that nucleons escape.
c. By being strongly electrically repelled by the protons.
d. By being captured and thus changing a stable isotope into an unstable one.
e. By changing the charge on the nucleus and thus causing beta decay.
d
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What defines the habitable zone around a star?
A) the region around a star where rocky planets can form B) the region around a star where humans can survive C) the region around a star where liquid water can exist on planetary surfaces D) the region around a star where its ultraviolet radiation is too weak to destroy biological organisms on a planetary surface E) the region around a star outside of its hot, tenuous corona
A hornet circles around a pop can at constant speed once per second in a path with a 12-cm diameter. We can conclude that the hornet's wings must push on the air with force components that are
a. straight down. b. down and inwards. c. down and outwards. d. down and backwards. e. down, inwards and backwards.
When at rest, a spacecraft has the same height as length. When moving at relativistic speeds in the direction of its length, which one of the following describes its length and height to an observer at rest?
a. Its length is decreased and its height is increased. b. Its length is decreased and its height is decreased. c. Its length is decreased and its height is unchanged. d. Its length is unchanged and its height is increased. e. Its length is increased and its height is decreased.
A spacecraft (mass = m1) orbits a planet (mass = m2) in a circular orbit (radius = r). What is the minimum energy required to send this spacecraft to a distant point in space where the gravitational force on the spacecraft by the planet is negligible?
A. Gm1m2/(4r) B. Gm1m2/R C. Gm1m2/(2R) D. Gm1m2/(3R) E. 2Gm1m2/(5R)