2 years ago

41. 2072 Set E Q.No. 11 A source of sound produces a note of

Physics

1 answer:

Nimfa-mama [501]2 years ago

4 0

A. is the answer for this

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What is the resistance of a 1.3-m-long copper wire that is 0.30 mm in diameter?

laiz [17]

The resistance R of a wire is given by:
$R= \frac{\rho L}{A}$
where
$\rho$ is the resistivity of the material
L is the length of the wire
A is the cross-sectional area of the wire.

For the wire in the problem, the resistivity is (copper resistivity) $\rho=1.68 \cdot 10^{-8} \Omega m$ . The length of the wire is L=1.3 m, while the cross-sectional area is
$A=\pi r^2 = \pi ( \frac{d}{2})^2 = \pi ( \frac{0.30 \cdot 10^{-3} m}{2} )^2 =7.07 \cdot 10^{-8} m^2$

so the resistance of the wire is:
$R= \frac{(1.68 \cdot 10^{-8} \Omega m)(1.3 m)}{7.07 \cdot 10^{-8} m^2}=0.31 \Omega$

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3 years ago

The following is current scientific evidence supporting the nebular theory on the formation of the solar system.

Feliz [49]

A.the composition of the inner and outer planets, current observations of star formation, and the motion of the solar system I hope this helps

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3 years ago

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8. An airplane is flying at 200 m/s when it touches the ground at the airport. It has a constant negative acceleration, and slow

Temka [501]

Answer:

Explanation:

Given

Initial velocity u = 200m/s

Final velocity = 4m/s

Distance S = 4000m

Required

Acceleration

Substitute the given parameters into the formula

v² = u²+2as

4² = 200²+2a(4000)

16 = 40000+8000a

8000a = 16-40000

8000a = -39,984

a = - 39,984/8000

a = -4.998m/s²

Hence the acceleration is -4.998m/s²

8 0

3 years ago

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Illusion [34]

Thomas Edison is the answer im 100% sure of it.

5 0

3 years ago

Evaluate u+xy where U=3 X=4 Y=7

Reptile [31]

Answer:

Explanation:

Given:

U=3

X=4

Y=7

u + xy

Substitute the given values to the equation:

3 + (4)(7)

3 + 28

6 0

2 years ago