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3 years ago

PLEASE HELP!! PHYSICS QUESTION-DOES ANYONE KNOW HOW TO DO THIS WITH THE WORKING OUT?!?

Physics

1 answer:

notsponge [240]3 years ago

4 0

Answer:

$1.5 \Omega$

Explanation:

The resistance of a piece of 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

In this problem, we have

$\rho = 3.3\cdot 10^{7} m$

L = 7.0 m

The diameter of the wire is 0.14 cm, so the radius is 0.07 cm, therefore the cross sectional area is

$A=\pi r^2 = \pi (0.07)^2=0.0154 cm^2 = 0.0154\cdot 10^{-4} m^2$

Therefore, the resistance is

$R=\frac{(3.3\cdot 10^{-7})(7.0)}{(0.0154\cdot 10^{-4})}=1.5 \Omega$

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Tyson Gay's best time to run 100.0 meters was 9.69 seconds. What was his average speed during this run, in miles per hour? (3.28

FinnZ [79.3K]

Answer:

23.086 mile/h

Explanation:

Given,

Distance Tyson Gay run = 100 m

time of run, t = 9.69 s

average speed of the in mph = ?

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v = 10.32 m/s

1 m = 3.281 ft

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3 years ago

Read 2 more answers

A flat coil of wire consisting of 20 turns, each with an area of 50 cm2, is positioned perpendicularly to a uniform magnetic fie

Nutka1998 [239]

Answer:

i = 0.5 A

Explanation:

As we know that magnetic flux is given as

$\phi = NBA$

here we know that

N = number of turns

B = magnetic field

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now we know that rate of change in magnetic flux will induce EMF in the coil

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$EMF = NA\frac{dB}{dt}$

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now by ohm's law we have

$current = \frac{EMF}{Resistance}$

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