The Chandrasekhar limit tells us that
a. accretion disks can grow hot through friction.
b. neutron stars of more than 3 solar masses are not stable.
c. white dwarfs more massive than 1.4 solar masses are not stable.
d. stars cannot travel through space too fast.
e. stars with a mass less than 0.5 solar masses will not go through helium flash.
c
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If an irregularly shaped object (such as a wrench) is dropped from rest in a classroom and feels no air resistance, it will
A) accelerate but will not spin. B) accelerate and turn until its center of gravity reaches its lowest point. C) accelerate and turn about its center of gravity with uniform angular speed. D) accelerate and turn about its center of gravity with uniform angular acceleration. E) accelerate and spin until its center of gravity reaches its highest point.
Giant spirals are the largest galaxies in the Universe
a. True b. False Indicate whether the statement is true or false
A star with an apparent magnitude of +2.3 and an absolute magnitude of +5.9 lies ________ than 10 parsecs away
Fill in the blank(s) with correct word
Three coplanar parallel straight wires carry equal currents I as shown below. The current in the outer wires is directed to the right, and that in the middle wire is directed to the left. Each pair of wires is a distance a apart. The direction of the magnetic force on the middle wire
A. is up out of the plane of the wires. B. is down into the plane of the wires. C. is in the plane of the wires, directed upwards. D. is in the plane of the wires, directed downwards E. cannot be defined, because there is no magnetic force on the middle wire.