A physics class in a large lecture hall has 15 students. The total mass of the students is about _____ kg. (You will need to make a reasonable estimate of a missing physical quantity.)
a. 102
c. 104
b. 103
d. 105
B
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If the temperature and pressure of an ideal gas is tripled, what is the ratio of the new volume to initial volume?
A. 1 B. 9 C. 3 D. 0.33
A beam of white light of a certain frequency is incident on a metal surface. If the work function of this surface is 2.20 eV, what frequency of light would give a maximum kinetic energy of 0.25 eV to the photoelectrons ejected from this surface?
A) 2.05 × 1014 Hz B) 1.02 × 1014 Hz C) 2.50 × 1014 Hz D) 3.53 × 1014 Hz E) 5.92 × 1014 Hz
A 1.8-kg block is projected up a rough 10° inclined plane. As the block slides up the incline, its acceleration is 3.8 m/s2 down the incline. What is the magnitude of the force of friction acting on the block?
a. 5.0 N b. 3.8 N c. 4.2 N d. 4.6 N e. 6.5 N
Polarized light is to have its polarization plane rotated by 90°. In which of the following cases does the final beam have the greatest intensity?
a. 3 polarizing filters, each rotate beam by 30°. b. 2 polarizing filters, both rotate beam by 45°. c. 1 polarizing filter, rotating beam by 90°. d. None of the above, polarized light can't be rotated.