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3 years ago

All recorded measurements require a number followed by a _______ .

1 answer:

7 0

Answer: unit

Jusitification:

An plain number does not inform the real meaning of the measure if you do not inform the unit of measurement.

Without the unit you cannot tell the real magnitude of objects or phenomena measured.

For example, suppose that some one asks how long is a boat and the answer is 20. What is it? 20 meters? 20 feet? 20 yards? You do not really know if it is a big boat or a small one until you inform the unit of measurement.

The same is true with any measurement. If you measure volumen you have to tell is the number reported is galon, liters, cubic centimeter, mililiter, cubir meter, or what.

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A small rocket to gather weather data is launched straight up. Several seconds into the flight, its velocity is 140 m/s and it i

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2 years ago

If the frequency of a wave is tripled, what happens to the period of the wave?

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3 years ago

A spring has a force constant of 500.0 N/m. Show that the potential energy stored in the spring is as follows: a. 0.400 J when t

kogti [31]

Answer:

(a) Hence, the potential energy = 0.400 J.

(b) Hence the potential Energy = 0.225 J.

(c) Hence the potential energy = 0 J

Explanation:

Potential Energy; This is the energy of a body, by virtue of its position in the gravitational field. The unit of potential energy is Joules (J)

the potential energy stored in a spring is

Ep = 1/2ke²..................................... Equation 1

Where Ep = potential Energy, k = force constant, e = extension.

When spring is stretched 4.00 cm, e = 4.00 cm = 4/100 = 0.04 m, and k = 500 N/m.

Substituting into equation 1

Ep = 1/2(500)(0.04)²

Ep = 0.4 J.

Hence, the potential energy = 0.400 J.

(b)

When the spring is compressed 3.00 cm, e = 3.00 cm = 3/100 = 0.03 m, and k = 500 N/m.

Substitute into equation 1,

Ep = 1/2(500)(0.03)²

Ep = 250(0.0009)

Ep = 0.225 J.

Hence the potential Energy = 0.225 J.

Substituting into equation 1

Ep = 1/2(500)(0)²

Ep = 250(0)

Ep = 0.

Hence the potential energy = 0 J

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2 years ago

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Answer:

Here is the complete question:

https://www.chegg.com/homework-help/questions-and-answers/magnetic-field-372-t-achieved-mit-francis-bitter-national-magnetic-laboratory-find-current-q900632

a) Current for long straight wire $=3.7\ MA$