If a light source is approaching you at a speed very close to the speed of light, it will appear:
A) redder than it is.
B) bluer than it is.
C) brighter than it is.
D) fainter than it is.
E) lower temperature than it is.
B
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Resistance and Resistivity: Copper wire #1 has a length L and a radius b. Copper wire #2 has a length 2L and a radius 2b. Which statement about the resistance across the ends of the wires is true?
A. The resistance of wire #1 is twice as high as that of wire #2. B. The resistance of wire #1 is equal to that of wire #2. C. The resistance of wire #1 is half that of wire #2. D. The resistance of wire #1 is four times higher than that of wire #2.
A roller coaster car (mass = M) is on a track that forms a circular loop (radius = r) in the vertical plane. If the car is to just maintain contact with the track at the top of the loop, what is the minimum value for its speed at that point?
A) rg B) 2rg C) (rg)1/2 D) (2rg)1/2 E) (0.5rg)1/2
What must occur for an object to be considered a main sequence star?
a. Hydrostatic equilibrium b. Nuclear fusion reaction in the core c. Protostar life begins d. Both a and b
A projectile is launched with initial velocity v0 at an angle of 30° above the horizontal. If a second projectile is launched with the same initial velocity but at angle of 60° above the horizontal
A) The range of the second projectile will be twice that of the first. B) The range of the second projectile will be 1.41 that of the first. C) The range of the second projectile will be one-half that of the first. D) The ranges of the two projectiles will be identical. E) It is impossible to compare the ranges of the two projectiles.