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andrew11 [14]
3 years ago
11

I need help on 7 and 8 thanks

Physics
1 answer:
Sauron [17]3 years ago
5 0
8. 107.1 MHz

7. 90.5 MHz
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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
lbvjy [14]

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

8 0
3 years ago
When you observe a physical property the substance
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<span>The observation or measurement of physical properties of matter does not change its composition or its chemical nature. Other examples of physical properties include the infrared spectrum, attraction or repulsion to magnets, viscosity and opacity.</span>
5 0
3 years ago
Read 2 more answers
1- What the relation ship between temperature and density of liquids?
defon

Answer:

Explanation:

1- Density increase as the temperature decreases. This is the reason why liquid water is more dense than solid water.

2- The only things that affect the period of a simple pendulum are its length and the acceleration due to gravity.

3- not really sure for that one...I will think about that.

4- same reason for number 3

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2 years ago
The resultant of 2 forces at right angles is 100 lbs. If one of the forces makes an angle of 30 degress with the resultant, comp
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Answer:

86.6 lbs

Explanation:

Let the force is X.

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X = 86.6 lbs

Other force Y

Sin30=\frac{X}{R}

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Y = 50 lbs

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3 years ago
The energy of the ball has been reduced by joules after bouncing back. This reduction happens because potential energy transform
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<span>This reduction happens because potential energy transforms to "thermal energy" and "sound energy"

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2 years ago
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