Suppose a white dwarf is gaining mass because of accretion from a binary companion. What happens if its mass reaches the 1.4 solar mass limit?
A) The white dwarf undergoes a collapse and expels the excess mass in a nova eruption.
B) The white dwarf (which is made mostly of carbon) suddenly detonates carbon fusion and this creates a white dwarf supernova explosion.
C) A white dwarf can never gain enough mass to reach the limit because a strong stellar wind prevents the accreting material from reaching it in the first place.
D) The white dwarf immediately collapses into a black hole, disappearing from view.
B
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A) a proton and an electron B) a electron and an antiproton C) an electron and a positron D) an electron and a photon E) a proton and an antiproton
Your favorite radio station is located due north of your house and broadcasts using a horizontal electric dipole antenna directed north-south. To receive this signal you need to
A. move to a town that is farther to the east or west. B. use a magnetic dipole antenna instead of an electric dipole antenna. C. orient the receiving antenna horizontally north-south. D. use a vertical receiving antenna.
Two blocks are connected by a string that goes over an ideal pulley as shown in the figure. Block A has a mass of 3.00 kg and can slide over a rough plane inclined 30.0° to the horizontal
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a. 2.0 m/s b. 2.2 m/s c. 2.5 m/s d. 2.7 m/s e. 3.1 m/s