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4 years ago

13

Two copper wires have the same length but different cross sectional areas. The cross-sectional area of wire 1 is , and that of w

ire 2 is . How are the resistances of the two wires related

1 answer:

pentagon [3]4 years ago

8 0

Explanation:

We know that resistance

$R= \frac{\rho L}{A}$

clearly,

R∝ 1/A

Greater the area cross section area of the.

therefore,

$\frac{R_1}{R_2} = \frac{A_2}{A_1} =\frac{d_2}{d_1}^2$

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Explanation:

Question 1

The moment when it has more potential energy is when the ball is at the highest point in the building, that is when the ball is at a height of 40 meters from the ground. It is taken as a point of reference of potential energy, the level of the soil, at this point of reference the potential energy is zero.

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Question 3)

As the ball drops all potential energy is transformed into kinetic energy, therefore being close to the ground, the ball will have its maximum kinetic energy.

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Question 4)

It can be easily calculated using the following equation

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Question 5)

True

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$E_{p}=2*9.81*20\\ E_{p}= 392.4[J]\\The kinetic energy is:\\E_{k}=0.5*2*(19.8)^{2} \\E_{k}=392[J]$

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