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3 years ago

If energy efficiency is improved, the cost of energy would decrease and _____.

Physics

2 answers:

avanturin [10]3 years ago

8 0

The correct answer to the question is : B) Less electricity would be used.

EXPLANATION :

As per the question, there is increment in the energy efficiency.

Normally efficiency is defined as the ratio of output energy to the input energy .

As the efficiency is increasing, the electrical devices will give more output. Hence, there will be less loss of electricity in the form of other types of energy.

Due to the loss of energy due to various external factors like friction, heating effect, there was more consumption of electricity.

The increment in efficiency will reduce the consumption of electricity.

Hence, the correct answer to the question is less electricity will be used.

SpyIntel [72]3 years ago

7 0

<span>-less electricity would be used</span>

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Answer: the furthest from the end prying out the nail

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4 years ago

While out hiking, you and your buddy decide to have some fun with the rocks laying all around. While sitting on a high cliff, ov

Ulleksa [173]

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4 years ago

Which statement describes the relationship between gravitational force and strong nuclear force? (2 points) Select one: a. Stron

Tamiku [17]

Answer:

b. Gravity is the weaker force; it is related to mass.

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6 0

4 years ago

Read 2 more answers

El siguiente esquema representa un objeto con un volumen de 2cm^3 sumergido en un recipiente que contiene agua. La densidad del

tresset_1 [31]

Answer:

Ver explicación

Explanation:

Según los principios de Arquímedes, el empuje hacia arriba de un objeto sumergido en un fluido es igual al peso del fluido desplazado.

Por eso

Empuje hacia arriba = volumen del objeto * densidad del fluido * aceleración debida a la gravedad

Empuje hacia arriba = 2 * 10 ^ -6 / 2 * 1 * 10 ^ 3 * 10

Empuje hacia arriba = 0.01 N

Desde;

Empuje hacia arriba = peso del fluido desplazado

peso del fluido desplazado = 0.01 N

Masa de fluido desplazado = 0.01 N / 10 = 1 * 10 ^ -3 Kg o 1 g

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3 years ago

An opera singer in a convertible sings a note at 550 Hz while cruising down the highway at 92 km/h . The speed of sound in the a

ELEN [110]

Answer:

A) 594 Hz

B) 512 Hz

Explanation:

Howdy!

This is a typical Doppler effect problem, whose formula is:

$f = \frac{v+v_{r} }{v+v_{s}} f_{0}$

Where :

$v_{r}$

is the velocity of the receiver (in our case is equal to zero)

$v_{s}$

is the velocity of the source (in our case is 92 km/h) which is positive when the source is moving away (second case) and negative otherwise.

$v_{s}$

Is the velocity of the wave in the medium.

Before we start calculating we need to have the velocity of the source in the same units as the velocity of the waves:

92km/h = 92*(1000)/3600 m/s = 25.5 m/s

When the source is moving towards the receiver the sign of the velocity is negative, so:

$f = \frac{343}{343-25.5} 550 Hz$

f = 594.1 Hz

B) Now the velocity of the source must change sign:

$f = \frac{343}{343+25.5} 550 Hz$

f = 511.9 Hz

<em>As a sanity check we know that when the source is moving towards the source the frequency is higher and when the source is moving away from the source the frequency is lower.</em>

8 0

3 years ago