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3 years ago

14

What was Laurentia and what lands was it composed of? What happened to it?

1 answer:

snow_lady [41]3 years ago

4 0

Laurentia, also called the North American Craton, is a huge continental craton. It<span> forms the ancient </span>geological<span> core of the </span>continent of North America.<span> It is made up of present day North America and Greenland. About 300 million years ago, it collided with the southern hemispheric continent of </span>Gondwana<span> and formed the supercontinent called Pangaea.</span><span> </span>

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2 years ago

A single conducting loop of wire has an area of 7.26E-2 m2 and a resistance of 117 Ω. Perpendicular to the plane of the loop is

cricket20 [7]

Answer:

$\frac{dB}{dt}$ = 591.45 T/s

Explanation:

i = induced current in the loop = 0.367 A

R = Resistance of the loop = 117 Ω

E = Induced voltage

Induced voltage is given as

E = i R

E = (0.367) (117)

E = 42.939 volts

$\frac{dB}{dt}$ = rate of change of magnetic field

A = area of loop = 7.26 x 10⁻² m²

Induced emf is given as

$E = A\frac{dB}{dt}$

$42.939 = (7.26\times 10^{-2})\frac{dB}{dt}$

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2 years ago

A 160cm long string has two adjacent resonance at 85hz frequencies . calculate : 1- the fundamental frequency , 2- the speed of

lara [203]

Length=l=160cm=1.6m

Frequency=85Hz

#1

Fundamental frequency be v

$\\ \sf\bull\longmapsto v=\dfrac{\nu}{2\ell}$

$\\ \sf\bull\longmapsto v=\dfrac{85}{2(1.6)}$

$\\ \sf\bull\longmapsto v=\dfrac{85}{3.2}$

$\\ \sf\bull\longmapsto v=26.6Hz$

#2

First we have to find wavelength

$\\ \sf\bull\longmapsto \lambda=\dfrac{c}{v}$

$\\ \sf\bull\longmapsto \lambda=\dfrac{3\times 10^8ms^{-1}}{26.6}$

$\\ \sf\bull\longmapsto \lambda=0.112\times 10^8m$

$\\ \sf\bull\longmapsto \lambda=112\times 10^5m$

$\\ \sf\bull\longmapsto \lambda=1.12\times 10^6m$

Now..

Velocity be v

$\\ \sf\bull\longmapsto v=f\lambda$

f is frequency

$\\ \sf\bull\longmapsto v=26.5\times1.12\times 10^6m$

$\\ \sf\bull\longmapsto v=29.68\times 10^6$

$\\ \sf\bull\longmapsto v=2.9\times 10^7m/s$

5 0

2 years ago