If a star's apparent visual magnitude is equal to its absolute visual magnitude, how far is the star located from Earth?
a. 0 pc b. 1 pc
c. 10 pc d. 100 pc
Question 2
An isolated black hole in empty intergalactic space would be difficult to detect because
a. there would be no stars behind it whose light would be affected by gravitational lensing.
b. it could not emit light from inside its event horizon.
c. no companion stars would be affected by its gravitational field.
d. no matter would be falling into it to create an X-ray-emitting accretion disk.
e. All of the other choices are correct.
False-color imagery of the Sun, a G-type main-sequence star, the closest to Earth.
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Pressure testing the cooling system. A typical hand-operated pressure tester applies pressure equal ...
Determined the magnitude of the magnetic force on the conductor.