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nirvana33 [79]
3 years ago
14

Bettina spoke into a microphone during the school play to increase the sound of her voice so the audience could hear her speak.

The loudness of Bettina’s voice was changed by what type of energy?
Physics
2 answers:
grandymaker [24]3 years ago
7 0
The loudness was increased by the amplifier which converted electrical energy into sound energy.
Sati [7]3 years ago
5 0

C.) Electric Energy

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A popular classroom demonstration is to place a gas can on a burner and boil water in it. Left unchecked this has the potential
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Answer:

D) shrivel up, since the atmosphere exerts more force on the can as it cools.

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As the water in the can is boiled the can gets heated up and contains hot vapour and gases which are rare in density and are in their expanded state. In this state when the can is sealed tightly such that no air leaks in or out of the can. When the temperature of the can drops, the gases shrink in volume and the pressure inside the can become less than the pressure of the atmosphere which leads to shriveling of the can.

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i throw a tennis ball straight down from the roof of a building 400 meters tall.id it leaves my hand at 10 m/s, how fast will it
Sidana [21]

consider the motion of the tennis ball in downward direction

Y = vertical displacement = 400 m

a = acceleration = acceleration due to gravity = 9.8 m/s²

v₀ = initial velocity of the ball at the top of building = 10 m/s

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using the kinematics equation

v² = v²₀ + 2 a Y

inserting the values

v² = 10² + 2 (9.8) (400)

v = 89.11 m/s

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Which of the following electrical components is a temporary electrical energy storage device?
7nadin3 [17]

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A capacitor

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Hope this helps! :)

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Friction- the external force that acts on objects and causes them to slow down when no other external force acts upon them.
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The perceived loudness of a sound is measured in
diamong [38]
<h2>Answer: decibels </h2>

The decibel dB is the relation between two values: the pressure produced by a sound wave and a pressure taken as a reference. Resulting in a dimensionless value.

It should be noted that itself<u> is not a unit of measure</u>, since in reality the unit is bel B (which <u>is not part of the International System of Units</u>) in honor of Alexander Graham Bell.

However, given the amplitude of the measured elements in practice, its submultiple, the decibel, is used. That is, this quotient is a logarithmic expression, where 1dB=0.1B

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