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3 years ago

2.0 A are flowing through an electric motor. How long will it take for 40 Coulombs to flow through the motor?

Physics

1 answer:

Mandarinka [93]3 years ago

4 0

Answer:

Answer: Magnitude = [____]; unit = [____].

Explanation:

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What word means the same thing as force of gravity?

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Answer:

B. Weight

Explanation:

Weight is the force of gravity exerted on a body

It's the force exerted on a body by the influence of the earth's gravitational force

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2 years ago

Rosie is reading an article about living cells. The article states that all living cells are composed of one or more cells, that

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Cell theory , because a cell wall is the surrounding area that protects a cell

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3 years ago

Which process requires water to gain 2260 joules of energy per gram?

yuradex [85]

Vaporization - The amount of heat needed to convert unit mass of a liquid into vapor form without a change in temperature is called heat of vaporization. For water the heat of vaporization is 2260 Joules / gram at its normal boiling point .

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3 years ago

A radioactive substance decays exponentially. A scientist begins with 200 milligrams of a radioactive substance. After 17 hours,

lianna [129]

75.17 mg of the radioactive substance will remain after 24 hours.

Answer:

Explanation:

Any radioactive substance will obey the exponential decay behavior. So according to this behavior, any radioactive substance will be decaying in terms of exponential form of disintegration constant and Time.

Disintegration constant is the rate of decay of radioactive elements. It can be measured using the half life time of the radioactive element .While half life time is the time taken by any radioactive element to decay half of its concentration. Like in this case, at first the scientist took 200 mg then after 17 hours, it got reduced to 100 g. So the half life time of this element is 17 hours.

Then Disintegration constant = 0.6932/Half Life time

Disintegration constant = 0.6932/17=0.041

Then as per the law of disintegration constant:

$N = N_{0}e^{-xt}$

Here N is the amount of radioactive element remaining at time t and $N_{0}$ is the initial amount of sample, x is the disintegration constant.

So here, $N_{0}$ = 200 mg, x = 0.041 and t = 24 hrs.

N = 200 × $e^{-24*0.041}$ =75.17 mg.

So 75.17 mg of the radioactive substance will remain after 24 hours.

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3 years ago

Question 3 of 10

Volgvan

Answer:

This oxygen reacts with the carbon of the positive electrodes, forming carbon dioxide, so they gradually burn away. As a result, the positive electrodes have to be replaced frequently. This adds to the cost of the process.

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3 years ago