Three long wires parallel to the x axis carry currents as shown. If I = 20 A, what is the magnitude of the magnetic field at the origin?
a.
37 ?T
b.
28 ?T
c.
19 ?T
d.
47 ?T
e.
58 ?T
c
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Energy Density: A 2.4 × 1014 Hz laser emits a 3.5-?s pulse that is 5.0 mm in diameter. The average energy density in the beam is 0.65 J/m3. What average power is emitted by this laser? (c = 3.0 × 108 m/s, ?0 = 4? × 10-7 T ? m/A, ?0 = 8.85 × 10-12 C2/N ? m2)
A. 3.8 kW B. 7.7 kW C. 12 kW D. 15 kW E. 19 kW
Can you think of any refinements to the model for PCM thermal storage as shown schematically in Figure 10-27?
What will be an ideal response?
A star can remain in the giant-star stage for about 90 percent of its total lifetime before it dies
Indicate whether the statement is true or false
There is a dislocation with a Burger’s vector between the origin of an FCC copper (Cu) crystal at 0,0,0 and the nearest lattice point in the (001) plane. The Cu lattice parameter is 0.362 nm.
(a) What is the Burger’s vector of this dislocation, in vector notation? (b) What is the magnitude of the Burger’s vector?