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3 years ago

A 1.5m wire carries a 3 A current when a potential difference of 74 V is applied. What is the resistance of the wire?

Physics

1 answer:

Allisa [31]3 years ago

4 0

Answer:

24.7 ohms

Explanation:

Given in the question,

electric current = 3 A

potential difference = 74 V

Using ohm's law

R = V/I

here,

R = resistance of wire

V = potential difference

I = electric current

plug value in the formula

R = 74/3

R = 24.7 ohms

Therefore, the resistance of the wire is, 24.7 ohms

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3 years ago

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Answer:

The coefficient of kinetic friction between the sled and the snow is 0.0134

Explanation:

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m = mass of sled = 15.2 kg

U = initial velocity of person = 3.63 m/s

u = initial velocity of sled = 0 m/s

After collision, the person and the sled would move with the same velocity V.

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$V=\frac{MU+mu}{M+m}$

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b) acceleration due to gravity (g) = 9.8 m/s²

d = 30 m

Using the formula:

$V^2=2\mu(gd)\\\mu=\frac{V^2}{2gd} \\\mu=\frac{2.81^2}{2*9.8*30} =0.0134$

The coefficient of kinetic friction between the sled and the snow is 0.0134

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