What gets left behind in the middle of a planetary nebula?

A.) A newborn star.
B.) A white dwarf.
C.) A neutron star.
D.) A black hole.
E.) None of the above.


Ans: B.) A white dwarf.

Physics & Space Science

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Doppler Effect: What is the frequency does a stationary observer hear when a train approaches her with a speed of 30 m/s. The frequency of the train horn is 0.600 kHz and the speed of sound is 340 m/s.

A. 551 Hz B. 600 Hz C. 653 Hz D. 658 Hz

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A 5.0 ?C charge is placed at the 0 cm mark of a meter stick and a -4.0 ?C charge is placed at the 50 cm mark. At what point on a line joining the two charges is the electric field zero?

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In order for two objects to have the same temperature, they must

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Physics & Space Science