Cygnus X-1 and LMC X-3 are black holes if the masses of the unseen companions perhaps may be
a. less than 3 solar masses.
b. more than 3 solar masses.
c. between 0.4 and 1.4 solar masses.
d. less than 0.4 solar masses.
e. not larger than the masses of the stars that we can see.
b
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A runner runs around a track consisting of two parallel lines 96 m long connected at the ends by two semicircles with a radius of 49 m. She completes one lap in 100 seconds. What is her average velocity?
A) 2.5 m/s B) 5.0 m/s C) 10 m/s D) 0 m/s E) 1.3 m/s
Which statements are true about a VIRTUAL image? (There may be more than one correct choice.)
A) Its location can be calculated, but it cannot be viewed directly by your eye without using auxiliary lenses. B) It cannot be photographed. C) It cannot be viewed on a screen. D) A plane mirror always forms a virtual image. E) A concave lens always forms a virtual image.
If seafloor spreading creates new lithosphere, does the size of Earth change?
A) Yes, Earth is getting larger. B) No, the extra crust is crumpled up to form mountains. C) No, older crust is recycled back into the asthenosphere. D) Yes, the Earth is shrinking because it is cooling.
An RLC circuit has L = 250 mH, C = 0.200 ?F, and R = 2.00 k?. What is the angular frequency of its damped oscillations?
What will be an ideal response?