Why is the night sky dark?
A) Dark matter obscures light from distant objects.
B) The dust clouds in interstellar space block the light.
C) The universe has a physical edge, beyond which there is nothing.
D) The universe is finite in age.
D
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A puddle of water has a thin film of gasoline floating on it. A beam of light is shining perpendicular on the film
If the wavelength of light incident on the film is 560 nm and the indices of refraction of gasoline and water are 1.40 and 1.33, respectively, what is the minimum thickness of the film to see a bright reflection? A) 100 nm B) 200 nm C) 300 nm D) 400 nm E) 500 nm
A 13000 N vehicle is to be lifted by a 25 cm diameter hydraulic piston. What force needs to be applied to a 5.0 cm diameter piston to accomplish this?
A) 260 N B) 520 N C) 2600 N D) 5200 N E) 13000 N
When we apply the Lorentz factor ? to length contraction, we
A) multiply by ? as in the equation for time dilation. B) multiply by the reciprocal of ? C) find it does not apply.
Metamorphism caused by the alteration of rock by both thermal and mechanical means is called
A) contact metamorphism. B) dynamic metamorphism. C) regional metamorphism. D) none of the above