The Chandrasekhar Limit is:
A) the upper mass limit for a white dwarf.
B) the temperature at which hydrogen fusion starts.
C) the temperature at which helium fusion starts.
D) the point at which a planetary nebula forms.
E) the lower mass limit for a Type II supernova.
A
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Force on a Wire: A wire along the z-axis carries a current of 4.9 A in the +z direction. Find the magnitude and direction of the force exerted on a 3.3-cm long length of this wire by a uniform magnetic field pointing in the -x direction having a magnitude 0.43 T.
What will be an ideal response?
Equilibrium: An object is being acted upon by three forces and moves with a constant velocity. One force is 60 N along the +x-axis, the second is 75 N along a direction making a counterclockwise angle of 150° with the +x-axis.(a) What is the magnitude of the third force?(b) What is the direction of the third force, measured clockwise from the +x-axis?
Fill in the blank(s) with the appropriate word(s).
Multiple-Object Accelerating Systems: A 3.0-kg mass and a 5.0-kg mass hang vertically at the opposite ends of a rope that goes over an ideal pulley. If the masses are gently released from rest, how long does it take for the 3.0-kg mass to rise by 1.0 m?
A. 0.41 s B. 0.74 s C. 0.82 s D. 1.8 s E. 0.90 s
Why is the tropical year shorter than the sidereal year?
What will be an ideal response?