A beam of light traveling in air strikes a glass slab at an angle of incidence less than 90°. After entering the glass slab, what does the beam of light do? (There could be more than one correct choice.)
A) I follows the same path as before it struck the glass.
B) It follows the normal to the glass slab.
C) It bends away from the normal at the point of contact.
D) It bends closer to the normal at the point of contact.
E) It slows down.
D, E
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A 120 kg mass is blown apart into a 80 kg piece and a 40 kg piece. After the blast, the two masses are moving apart with a relative velocity of 60 m/s. The velocity of the 80 kg mass is
A. 59 m/s. B. 51 m/s. C. 34 m/s. D. 20 m/s. E. 14 m/s.
An electric motor on an airplane operates on 24 volts and draws a current of 15 amperes. (a) What is the power consumption of the motor? (b) How much energy does the motor use during a 2 hour flight?
Which change will not change the kinetic energy of the most energetic electrons emitted in the photoelectric effect?
a. changing the brightness of the light b. changing the frequency of the light c. changing the metal the light is hitting d. All of the above will change the electron's kinetic energy.
A mass is bouncing on the end of a spring with a period T when measured by a ground observer. What would the period of oscillation be (as measured by the same observer) if the mass and spring were moving past the ground observer at a speed of 0.600c?
a. 0.440 T c. 0.600 T b. 1.25 T d. 1.67 T