What is true about resistance? Check all that apply. A. It is the excess accumulation of electric charge B. It is measured in oh
1 answer:
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Answer:
- See the graph attached with the vectors.
Explanation:
The exercise is to draw the corresponding vectors:
Every one is the multiplication of a scalar by a vector.
The result of multiplying a scalar by a vector is a vector with the same direction of the original vector enlarged in a factor equal to the scalar magntitude.
Thus, in a graph the resulting vector is represented with a parallel arrow and pointing in the same direction as the original vector but with a length equal to the original length multiplied by the magnitude of the scalar.
For instance, the vector is represented with an arrow in the same direction of
and with twice its length.
The figure attached contains the five requested vectors using the procedure explained above.
Answer:
The radius of the cable is 0.0083 m or 8.3 mm.
Explanation:
The resistance of copper cable of 1 meter length will be given by
.... (i)
where the resistivity of copper is , and l is the length of the wire which is considered to be 1m, and a is the cross sectional area of the wire in
.
From the formula of power we know that, .... (ii)
Therefore 2 W/m = .... (iii)
where the resistance,R, actually means the resistance of the cable per meter.
Therefore R ( resistance of cable per meter)
= ohms / meter. .... (iv)
Therefore from (i)
=
..... (v)
where cross sectional area of the cable, a = ,
where r is the radius of the cable, and length of cable,l = 1m.
Therefore r =
The gravitational force between the spheres is
where <em>G</em> = 6.674 x 10⁻¹¹ N m²/kg².
The weight of the lighter sphere is
where <em>g</em> = 9.80 m/s².
The ratio between the two forces is then