Light enters air from water. The angle of refraction will be
A) greater than the angle of incidence.
B) equal to the angle of incidence.
C) less than the angle of incidence.
A
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A can, after having been given a kick, moves up along a smooth hill of ice. It will
A) have a varying acceleration along the hill. B) have the same acceleration, both up the hill and down the hill. C) have a constant acceleration up the hill, but a larger constant acceleration when it comes back down the hill. D) have a constant acceleration up the hill, but a smaller constant acceleration when it comes back down the hill. E) travel at constant velocity.
The experimental observation(s) below that require(s) a quantum explanation for the photoelectric effect
a. is that more photoelectrons are emitted when the light frequency increases. b. is that the maximum kinetic energy of the photoelectrons is related linearly to the frequency of the light. c. is that every metal surface has a work function, a minimum amount of energy needed to free electrons. d. is that the stopping potential measures the kinetic energy of the photoelectrons. e. are all of the above.
A simple beam (L 5 9 m) with attached bracket BDE has force P 5 5 kN applied downward at E. The bending moment just right of B is approximately:
(A) 6 kN?m
(B) 10 kN?m
(C) 19 kN?m
(D) 22 kN?m
A planet is discovered to orbit around a star in the galaxy Andromeda, with the same orbital diameter as the Earth around our sun
If that star has 4 times the mass of our sun, what will the period of revolution of that new planet be, compared to the Earth's orbital period? A) four times as much B) one-half as much C) one-fourth as much D) twice as much E) times as much