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3 years ago

3)

Physics

1 answer:

Elza [17]3 years ago

8 0

c) both direct and alternating current

Because Ampere's Law, a magnetic field is produced whenever an electrical charge is in motion. So, both kind of currents produces a magnetic field when electrical current is flowing through a wire.

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The above stress can be also approximated by a sinusoidal function (i.e. sine wave) with an average 3,811 kPa, amplitude 430 kPa

stepan [7]

Answer:

306.08 kPa

Explanation:

Given data

Average stress of first wave = 3811 kPa

amplitude of first wave ( A1 ) = 430 kPa

Frequency of first wave = 6 Hz

Determine the average stress of the second sinusoidal component in kPa

Amplitude of the additional wave (A2add) = $\frac{A1}{2}$ = 430 / 2 = 215 kPa

next we will determine the resultant amplitude of the second wave

A2 = $\sqrt{A^{2} _{1} } + A^{2} _{2add} + 2A_{1}A_{2add} Cos\alpha$

= $\sqrt{430^2+ 215^2 + 2(430*215) * cos 90}$

= $\sqrt{184900 + 46225 }$

= $\sqrt{231155}$ = 480.79

hence the average stress of the second sinusoidal component

= $\frac{2A_{2} }{\pi }$

= $\frac{2 * 480.79 }{\pi }$ = 306.08 kPa

6 0

3 years ago

Firetrucks have the world FIRE written two ways,as seen here,on the front of the truck.Why is that ?

docker41 [41]

Answer:

While the image this question refers to is missing, I am assuming it shows the word FIRE (1) written in a normally readable way, (2) written in a mirrored way. The display (2) is used in order for other vehicle drivers being able to read the word FIRE in their mirrors (rearview and side). The word printed in a mirrored way will appear normal via a mirror (i.e., the mirror "undoes" the mirroring originally introduced).

4 0

3 years ago

Plz help i'm desperate! Why are all people on Earth members of the same biological Species?

Alex Ar [27]

Answer:

D.) All people can mate with one another and have children

Explanation:

7 0

3 years ago

The early earth was much cooler than it is today. a. True b. False

Pie

This statement is true. Early earth was much cooler than it is today.

This is because the pollution as well as the population number was very small compared to nowadays population and pollution.
The pollution mainly is causing a decay in the ozone layer which protects the earth from uv rays. Thus, more of these rays enter the atmosphere and increase the temperature.
The increase in population along with the decrease in green areas leads to the increase in the percentage of carbon dioxide in the atmosphere, which again leads to an increase in the temperature.

5 0

3 years ago

Two volumes of William Shakespeare stand on a bookshelf next to each other: volume one, then volume two. Each volume is 4 cm thi

Setler79 [48]

Answer:

L = 7 [cm]

Explanation:

To solve this problem we must analyze each of the distances mentioned and take into account the number of covers and thicknesses of these.

The worm crosses through the sheets of the first book, this distance can be determined by the following length analysis.

4 = P + 2*C

Where:

P = thicknesses of the pages [cm]

C = thicknesses of each cover [cm]

P = 4 - 2*(0.5)

P = 3 [cm]

The distance crossed was:

L = P + 2C + P "the pages of the first book + 2 covers + the pages of the second book"

L = 3 + (2*0.5) + 3

L = 7 [cm]

7 0

3 years ago