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3 years ago

Most of the energy we use today comes from renewable sources/ a. True b. False

Physics

2 answers:

RSB [31]3 years ago

7 0

False, because most of it is diesel and petrol, which are not renewable sources.( I'm not 100% sure though)

aleksley [76]3 years ago

6 0

True because it could be all things like plants, food, etc

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An athlete runs a 100 m race in 10 seconds against a friction force of 100N. How do I work out his power output?

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3 years ago

As sound waves move from air to glass, the wave property of ________ will cause the wave to bend in that direction

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3 years ago

Changes in behavior of managers, coworkers, and subordinates can be a warning sign before a layoff. True or false

Yakvenalex [24]

Answer:

The correct answer is - true.

Explanation:

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2 years ago

A long solenoid with 1.65 103 turns per meter and radius 2.00 cm carries an oscillating current I = 6.00 sin 90πt, where I is in

Leno4ka [110]

Answer:

The electric field is $35\cos(90\pi t)\ mV/m$

Explanation:

Given that,

Radius = 2.00 cm

Number of turns per unit length $n= 1.65\times10^{3}$

Current $I = 6.00\sin 90\pi t$

We need to calculate the induced emf

$\epsilon =\mu_{0}nA\dfrac{dI}{dt}$

Where, n = number of turns per unit length

A = area of cross section

$\dfrac{dI}{dt}$ =rate of current

Formula of electric field is defined as,

$E=\dfrac{\epsilon}{2\pi r}$

Where, r = radius

Put the value of emf in equation (I)

$E=\dfrac{\mu_{0}nA\dfrac{dI}{dt}}{2\pi r}$ ....(II)

We need to calculate the rate of current

$I=6.00\sin 90\pi t$ ....(III)

On differentiating equation (III)

$\dfrac{dI}{dt}=90\pi\times6.00\cos(90\pi t)$

Now, put the value of rate of current in equation (II)

$E=\dfrac{4\pi\times10^{-7}\times1.65\times10^{3}\times\pi\times(2.00\times10^{-2})^2\times90\pi\times6.00\cos(90\pi t)}{2\pi\times 2.00\times10^{-2}}$