A wrench is acting on a nut. The length of the wrench lies directly to the east of the nut. A force 150 N acts on the wrench at a position 15.0 cm from the center of the nut in a direction 30.0° north of east
What is the torque about the center of the nut? A)
22.5 N?m
B)
11.3 N?m
C)
19.5 N?m
D)
2250 N?m
E)
1949 N?m
B
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How long ago did the rock solidify? A) 2.6 billion years B) 0.50 billion years C) 1.8 billion years D) 0.30 billion years
If the hydrogen atom is in the n = 4 state, what is the largest number of photons that can be emitted as the atom goes back to the ground state?
A) 0 B) 4 C) 2 D) 3 E) 1 F) 5
A nearsighted person wears contact lenses having a power of -0.15 diopters. What is the person's uncorrected far point?
A) 1.5 m B) 3.3 m C) 6.0 m D) 6.7 m
Two tanks of gas, one of hydrogen, H2, and one of helium, He, contain equal numbers of moles of gas. The gram-molecular mass of He is twice that of H2 . Both tanks of gas are at the same temperature, 293 K. Which statement(s) below is(are) correct when we ignore vibrational motion?
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