Three surfaces are interacting with each other through thermal radiation. If the
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Two infinite, uniformly charged, flat surfaces are mutually perpendicular. One of the sheets has a charge density of +60 pC/m2, and the other carries a charge density of ?80 pC/m2. What is the magnitude of the electric field at any point not on either surface?
A. 1.1 N/C B. 5.6 N/C C. 7.9 N/C D. 3.8 N/C E. 4.0 N/C
A cart with an initial velocity of 5.0 m/s to the right experiences a constant acceleration of 2.0 m/s2 to the right. What is the cart's displacement during the first 6.0 s of this motion?
A) 10 m B) 55 m C) 66 m D) 80 m
Because the factor h on the right side of the Heisenberg uncertainty principle has units of Joule-seconds, it suggests that the energy of a system also has uncertainty. The uncertainty in energy depends on the length of the time interval during which a system exists. DEDt ³ h/4p. Suppose an unstable mass is produced during a high-energy collision such that the uncertainty in its mass is me/100
(me = 9.11 × 10^-31 kg.) How long will this particle exist? a. 6.4 × 10^-20 s b. 2.3 × 10^-23 s c. 1.0 × 10^15 s d. 1.2 × 10^13 s e. 8.1 × 10^-19 s
What did the International Astronomical Union classify Pluto as in 2006?
a. asteroid b. comet c. planet d. dwarf planet e. meteor