Stars A and B are both black holes but have different masses. If the mass of star A is twice as much as the mass of star B, the average density of star A, compared to the average density of star B will be
A) the same.
B) four times as much.
C) one-fourth as much.
D) half as much.
E) twice as much.
C
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Bok globules are small, dark fragments of the interstellar medium
a. True b. False Indicate whether the statement is true or false
Microfossils found in northwestern Australia in 2011 appears to have used compounds based on which element for metabolism?
A) sulfur B) oxygen C) nitrogen D) carbon
A particle (mass = 5.0 g, charge = 40 mC) moves in a region of space where the electric field is uniform and is given by Ex = -5.5 N/C, Ey = Ez = 0 . If the position and velocity of the particle at t = 0 are given by x = y = z = 0 and vx = 50 m/s, vy = vz = 0, what is the distance from the origin to the particle at t = 2.0 s?
a. 60 m b. 28 m c. 44 m d. 12 m e. 88 m
Plane Mirrors: A laser beam strikes a plane mirror's reflecting surface with an angle of incidence of 43°. What is the angle between the incident ray and the reflected ray?
A. 43° B. 86° C. 45° D. 90° E. 0°