A 150 N picture hangs from a nail in the wall. The maximum shear stress the nail can sustain is 2.00 
The smallest diameter the nail can be is
A. 9.77 mm.
B. 8.22 mm.
C. 7.97 mm.
D. 7.52 mm.
E. 6.03 mm.
A. 9.77 mm.
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Violet light (? = 430 nm) is incident on a piece of potassium (? = 2.20 eV). What is the maximum kinetic energy of the ejected photoelectrons? (h = 6.63 × 10^?34 J?s, c = 3.00 × 10^8 m/s, 1 eV = 1.60 × 10^?19 J, and 1 nm = 10?9 m)
a. 2.43 eV b. 0.69 eV c. 2.89 eV d. 5.09 eV e. 0.96 eV
The ________ is a measure of the stability of the atmosphere, usually degraded by turbulent currents in the air
Fill in the blank(s) with correct word
If a net external force acts on a system, what will change?
a. The sum of the momenta of all objects in the system. b. The momentum of no more than one object in the system. c. The sum of the magnitudes of each momentum. d. The momentum of exactly one object in the system. e. The momenta of all but one of the objects in the system.
A nearsighted person cannot see objects beyond 80 cm from his eyes
Which one of the following combinations represents the correct focal length and the refractive power of the contact lenses that will enable him to comfortably see the distant objects clearly? A) +80 cm, -1.3 diopters B) -80 cm, +1.3 diopters C) +80 cm, +1.3 diopters D) -1.3 cm, +1.3 diopters E) -80 cm, -1.3 diopters