A driver in a car traveling at slams on the brakes and skids to a stop. If the coefficient of friction between the tires and the level road is 0.80, how long will the skid marks be?
A) 37 m
B) 30 m
C) 46 m
D) 34 m
A
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The RR Lyrae stars all have periods of
A) less than a second. B) several minutes. C) several hours. D) several days. E) several weeks.
C. J. Davisson & L. H. Germer
A) were first to produce X-ray-like diffraction patterns of electrons passing through thin metal foil (1927). B) were first to produce diffraction patterns of electrons in crystals (1927). C) predicted the positron from relativistic quantum mechanics (1928). D) set the limits on the probability of measurement accuracy (1927). E) discovered the positron using a cloud chamber (1932).
Consider two charged spheres, one with charge +2 C and the other with ?2 C. A proton (a positively charged particle) is at the point halfway between the spheres. What is not zero?
a. the potential energy of the proton b. the work to move the proton from infinity to that point c. the force on the proton d. all of the three above are zero
Determine the energy stored in the 40-?F capacitor
a.
2.4 mJ
b.
1.6 mJ
c.
2.0 mJ
d.
2.9 mJ
e.
4.0 mJ