Unpolarized light of intensity I0 passes through two sheets of ideal polarizing material. If the transmitted intensity is 0.375I0, what is the angle between the polarizers?
a. 22.5°
c. 30°
b. 60°
d. 45°
C
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Earth's mantle is
a. metallic. b. very dense gas. c. solid. d. liquid.
Ellen says that whenever the acceleration is directly proportional to the displacement of an object from its equilibrium position, the motion of the object is simple harmonic motion. Mary says this is true only if the acceleration is opposite in direction to the displacement. Which one, if either, is correct?
a. Ellen, because ?2 is directly proportional to the constant multiplying the displacement and to the mass. b. Ellen, because ?2 is directly proportional to the mass. c. Mary, because ?2 is directly proportional to the constant multiplying the displacement and to the mass. d. Mary, because ?2 is directly proportional to the mass. e. Mary, because the second derivative of an oscillatory function like sin(?t) or cos(?t) is always proportional to the negative of the original function.
An astronaut is on a 100-m lifeline outside a spaceship, circling the ship with an angular speed of 0.100 rad/s. How far inward can she be pulled before the centripetal acceleration reaches 4g = 39.2 m/s2?
a. 50.0 m c. 72.7 m b. 70.6 m d. 89.9 m
Electric forces within an atomic nucleus tend to
A) hold it together. B) push it apart. C) neither of these