After a supernova explosion, the remains of the stellar core can be

A) either a neutron star or a black hole.
B) a neutron star only.
C) a black hole only.
D) a white dwarf, neutron star, or black hole.


A) either a neutron star or a black hole.

Physics & Space Science

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A refrigerator removes heat from the freezing compartment at the rate of 20 kJ and ejects 24 kJ into the room per cycle. What is the coefficient of performance?

A. 4 J B. 20 J C. 24 J D. 44 J

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What current in a solenoid 15.0-cm long wound with 100 turns would produce a magnetic field equal to that of the Earth, 5.00 × 10^-5 T?

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The condition for interference maxima for a diffraction grating is identical to that for

A) a narrowing single slit. B) a double slit. C) a thin film. D) a wide single slit.

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A 2 500-kg car moving north collides with a 2 000-kg car moving west. After the collision, the cars stick together and move at an angle of 45° north of west at a speed of 8.0 m/s. What was the initial speed of the 2 500-kg car?

a. 20 m/s b. 10.2 m/s c. 14 m/s d. 9.3 m/s

Physics & Space Science