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oksano4ka [1.4K]
3 years ago
13

If you have a device that has an energy efficiency of 0.4 and you put in 100 units of energy, how many units of useful energy wi

ll you get out of it?
Physics
2 answers:
PIT_PIT [208]3 years ago
7 0
<span>If its 0.4%, the answer will be 0.4

or else it will be 40. </span>
tamaranim1 [39]3 years ago
4 0

Answer:

40 units

Explanation:

efficiency, η = 0.4

Input Energy, Q1 = 100 units

Let output energy is Q2.

Efficiency is defined as the ratio of output energy to the input energy.

η = Q2 / Q1

Q2 = η x Q1

Q2 = 0.4 x 100 = 40 units

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What does solution mean in science
slega [8]
A solution is a mixture composed of two or more substances which is always homogeneous. One substance dissolves in with the other substance making a solution.

Hope this helps!
8 0
4 years ago
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A point charge of -2 µC is located at the origin. A second point charge of 6 µC is at x = 1 m, y = 0.5 m. Find the x and y coord
Soloha48 [4]

Answer:

x coordinate = -1.66 m

y coordinate is = -0.825m

Explanation:

Suppose z be the distance form the first charge and z + sqrt(1^2 +.5^2) be the distance from the second So z + sqrt(1+.25) = z + 1.12

We have k*2.0x10^-6/s^2 = k*6x10^-6/(s+1.12)^2

0.0356s^2 -0.019s-0.0897=0  

s=1.876m

The angle of the line between the two charges is arctan(.5/1) = 26.6o

x coordinate = -1.876*cos(26.6) = -1.66m

y coordinate is -1.876*sin(26.6) = -0.825m

3 0
3 years ago
If the distance between two masses is tripled, the gravitational force between changes by a factor of:_______
adell [148]

Answer:

option A

Explanation:

given,

distance between two masses is doubled

new distance, r' = 3 r

using gravitational force equation

F = \dfrac{GMm}{r^2}............(1)

new gravitational force

F' = \dfrac{GMm}{r'^2}

now from the given condition

F' = \dfrac{GMm}{(3r)^2}

F' = \dfrac{GMm}{9r^2}

F' = \dfrac{1}{9}\dfrac{GMm}{r^2}

now, from equation (1)

F' = \dfrac{1}{9}F

\dfrac{F'}{F} = \dfrac{1}{9}

now, the change in gravitational force factor is equal to \dfrac{1}{9}

Hence, the correct answer is option A

3 0
3 years ago
Momentum of an object is determined to be 7.2 ×10 to the negative 3 kg
abruzzese [7]
Answer:

0.0072

Explanation

7.2x10^-3= 0.0072
6 0
3 years ago
An 97 kg climber climbs to the top of Mount Everest, which has a peak height of 8850 m above sea level. What is the climber’s po
Kisachek [45]
Eg=mgh
Eg=(97)(9.8)(8850)
Eg=8412810J
4 0
3 years ago
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