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A surface completely surrounds a +4.7 10-6 C charge. Find the electric flux through this surface when the surface is a sphere with a radius of 0.40 m, a sphere with a radius of 0.20 m, and a cube with edges that are 0.20 m long.
(a) a sphere with a radius of 0.40 m N · m2/C
(b) a sphere with a radius of 0.20 m N · m2/C
(c) a cube with edges that are 0.20 m long N · m2/C
The 4 block in the figure is attached to a vertical rod by means of two strings. When the system rotates about the axis of the rod, the strings are extended and the tension in the upper string is 77.
The nearest star to Earth is Proxima Centauri, 4.3 light years away. How long does the trip take according to Earth observers
An RL circuit consists of a switch, an emf source Eo, a 4 kΩ resistor, and a 5 H inductor. If the potential across resistor is 16 V 5 ms after switch is closed, find out the source emf, Eo.
Find the probability that the electron will tunnel through the barrier.
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A proton enters the gap between a pair of metal plates (an electrostatic separator) that produces a uniform, vertical electric field between them. Ignore the effect of gravity on the proton.
The absorption spectrum of an atom consists of the wavelengths 200 nm, 300 nm, and 500 nm. What wavelengths are seen in the atom's emission spectrum?
A 0.45 V potential difference is maintained across a 1.3m length of tungsten wire that has a cross-sectional area of 0.67 mm2 and the resistivity of the tungsten is 5.6 ×10−8 · m. What is the current in the wire?
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