Cosmological redshift is the result of
A) the high speeds at which galaxies move within clusters.
B) the expansion of the universe.
C) old, red stars in distant galaxies.
D) supermassive black holes.
B) the expansion of the universe.
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A ball is thrown at an angle above the horizontal. The horizontal speed of the ball is 20 m/s and the ball covers a distance of 10 m. The maximum height of the arc through which the ball travels is
A. 0.31 m B. 1.2 m. C. 4.9 m. D. 10 m.
What is the reason for the seasons on Earth?
a) Earth is cloest to the Sun in July, farthest from the Sun in January b) Earth is tilted with respect to the Sun by about 23.5 degrees c) Earth orbits the Sun more slowly in winter, faster in summer d) Earth rotates more slowly in winter, faster in summer e) Earth's Moon blocks more sunlight from reaching Earth in winter than in summer
An electron moving in the positive x direction experiences a magnetic force in the positive z direction. If Bx = 0, what is the direction of the magnetic field?
a. negative y direction b. positive y direction c. negative z direction d. positive z direction e. negative x direction
Velocity Addition: Consider three galaxies, Alpha, Beta and Gamma. An astronomer in Beta sees each of the other two galaxies moving away from her in opposite directions at 0.70c. At what speed would an observer in Alpha see the galaxy Beta moving?
A. 0.82c B. 0.70c C. 0.94c D. 0.35c E. 0.57c