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dewayne16641
12.03.2020 •
Physics
A positive point charge (q 7.2 108 C) is surrounded by an equipotential surface A, which has a radius of rA 1.8 m. A positive test charge (q0 4.5 1011 C) moves from surface A to another equipotential surface B, which has a radius rB. The work done as the test charge moves from surface A to surface B is WAB8.1 109 J. Find rB.
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Ответ:
Explanation:
The potential at point A due to point charge at center .
V₁ =
= 7.2 x 10⁻⁸ x 9 x 10⁹ [
]
Similarly
The potential at B
V₂ =
= 7.2 x 10⁻⁸ x 9 x 10⁹ [
]
The potential difference
V = V₂ - V₁ = 648 [
-
]
The work done
W = q₀ V = 4.5 x 10⁻¹¹ x 648 [
-
]
But W = 8.1 x 10⁻⁹ J
Thus equation is
8.1 x 10⁻⁹ = 4.5 x 10⁻¹¹ x 648 [
-
]
0.28 = [
-
] or
= 0.28 + 0.55 = 0.83
or
= 1.2 m
Ответ:
Distance traveled is the average velocity times time. When something is dropped (or thrown), it accelerates downward in accord with the acceleration of gravity ( g = 9.8m/sec2)
The increase in velocity while falling is simply t * 9.8, t = 2, so the increase is 19.6 m/s. The initial velocity is 3, so the final is 22.6, and the average is 25.6/2 = 12.8m/s
Therefore, d = v(average) * t = 12.8 * 2 = 25.6m
The equivalent formula is:
d = v(initial)*t + (a*t2) / 2
d = 3*2 + 4.9 * 4 = 25.6
Explanation:
Distance traveled is the average velocity times time. When something is dropped (or thrown), it accelerates downward in accord with the acceleration of gravity ( g = 9.8m/sec2)
The increase in velocity while falling is simply t * 9.8, t = 2, so the increase is 19.6 m/s. The initial velocity is 3, so the final is 22.6, and the average is 25.6/2 = 12.8m/s
Therefore, d = v(average) * t = 12.8 * 2 = 25.6m
The equivalent formula is:
d = v(initial)*t + (a*t2) / 2
d = 3*2 + 4.9 * 4 = 25.6