An electron moves with a speed of 3.0 × 104 m/s perpendicular to a uniform magnetic field of 0.40 T. What is the magnitude of the magnetic force exerted on the electron? (e = 1.60 × 10-19 C)
A) 4.8 × 10-14 N
B) 1.9 × 10-15 N
C) 5 × 10-20 N
D) 2.2 × 10-24 N
E) 0 N
B
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A 15 cm black disk is placed halfway between two black 3-m-diameter disks that are 7 m apart with all disk surfaces parallel to each other. If the surroundings are 0 K, determine the temperature of the two larger disks required to maintain the smaller disk at 540°C.
GIVEN
GIVEN
• A black disk (A1) halfway between two other black disks (A2 & A3)
• Diameter of A1 (D1) = 15 cm = 0.15 m
• Diameter of A2 and A3: (D2 = D3) = 3 m
• Distance between A2 and A3 (2L) = 7 m
• Surrounding temperature (T?) = 0 K
• Temperature of A1 (T1) = 540°C = 813 K
FIND
• The temperature A2 and A3 required ASSUMPTIONS
• A2 and A3 are at the same temperature (T2 = T3)
• Steady state conditions
SKETCH
PROPERTIES AND CONSTANTS
the Stephan-Boltzmann constant (?) = 5.67 × 10–8 W/(m2 K4)
The _______________ time is the amount of time it took light to travel from a celestial object to Earth
Fill in the blank(s) with correct word
_______________ clusters of galaxies contain closely spaced galaxies and often contain giant elliptical galaxies and a hot intergalactic medium
Fill in the blank(s) with correct word
LR Circuits: As shown in the figure, a circuit consists of a resistor R = 18 ? in series with an ideal inductor L = 33 H having no resistance. At time t = 0 s, there is a 12-A current in the circuit. When the magnetic energy of the inductor is 1600 J, what is the rate of dissipation of energy in the resistor?
A. 1700 W B. 440 W C. 870 W D. 1300 W E. 2200 W