A 500 nm light is reflected constructively from a thin layer of oil of index of refraction 1.25, which rests on the top of water of index of refraction 1.33. What is the minimum thickness of the layer of oil?
A) 100 nm
B) 150 nm
C) 175 nm
D) 200 nm
E) 225 nm
D
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An atom of the element iron has an atomic number of 26 and an atomic mass number of 56. If it is neutral, how many protons, neutrons, and electrons does it have?
A) 26 protons, 30 neutrons, 26 electrons B) 26 protons, 30 neutrons, 30 electrons C) 13 protons, 56 neutrons, 13 electrons D) 13 protons, 43 neutrons, 13 electrons E) 26 protons, 56 neutrons, 26 electrons
An un-stretched hanging spring is 50 cm long. Suspending a 100-N block from it increases its length to 60 cm. Adding another 100-N block makes the spring's length
A) 60 cm. B) 70 cm. C) 80 cm. D) 100 cm. E) 120 cm.
A wheel accelerates from rest to at a uniform rate of 58 rad/s2. Through what angle (in radians) did the wheel turn while accelerating?
A) 30 rad B) 24 rad C) 60 rad D) 38 rad
A freely falling object
a. has a uniformly increasing velocity. b. is unaffected by gravity. c. has a uniformly increasing acceleration. d. has a uniformly increasing displacement.