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Slav-nsk [51]
3 years ago
5

Why are force fields used to describe magnetic force? A. Magnetic force acts between two objects that are not touching. B. Magne

tic force is a form of gravity. C. Magnetic force acts between any two objects with mass. D. Magnetic force can only attract objects.tic force?
Physics
1 answer:
bonufazy [111]3 years ago
5 0

Answer:

The Answer is D. Magnetic force can only attract objects.

Explanation:

Magnetic forces can cause attraction or repulsion depending on the effect caused by the movement of particles.

<h2><em><u>Edit: Pleas correct me if i'm wrong!!!!</u></em></h2>
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The resistance, R, of a wire varies directly as its length and inversely as the square of its diameter. If the resistance of a w
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R is proportional to the length of the wire:

R ∝ length

R is also proportional to the inverse square of the diameter:

R ∝ 1/diameter²

The resistance of a wire 2700ft long with a diameter of 0.26in is 9850Ω. Now let's change the shape of the wire, adding and subtracting material as we go along, such that the wire is now 2800ft and has a diameter of 0.1in.

Calculate the scale factor due to the changed length:

k₁ = 2800/2700 = 1.037

Scale factor due to changed diameter:

k₂ = 1/(0.1/0.26)² = 6.76

Multiply the original resistance by these factors to get the new resistance:

R = R₀k₁k₂

R₀ = 9850Ω, k₁ = 1.037, k₂ = 6.76

R = 9850(1.037)(6.76)

R = 69049.682Ω

Round to the nearest hundredth:

R = 69049.68Ω

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D. Exercise promotes self-control
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Monica [59]

Answer:

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A 2.0 kg block has a rope attached to the block on a table and is pulled with a force of 8.0 N. The block accelerated at 2.5m/s^
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Answer:

0.15

Explanation:

Assuming the rope is horizontal, sum the forces in the y direction:

∑F = ma

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F − Nμ = ma

Substitute:

F − mgμ = ma

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