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2 years ago

A hair dryer wastes 376J for every 1500J of electrical energy it uses. How efficient is the hairdryer?

Mathematics

1 answer:

Leni [432]2 years ago

8 0

Answer:

$\boxed{efficiency, \gamma = 74.93 \%}$

Step-by-step explanation:

$efficiency, \: \gamma = \frac{1500 - 376}{1500} \times 100 \\ \gamma = \frac{1124}{1500} \times 100 = 74.93 \\ efficiency, \gamma = 74.93 \%$

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I need help finding the lowest term for -8/9+11/15

Liono4ka [1.6K]

Answer:

-7/45

Step-by-step explanation:

First, find the lowest common denominator for 9 and 15. It's 45. Make both fractions over 45 by multiplying the top and bottom by the same number.

$-\frac{8}{9} +\frac{11}{15}$

$= -\frac{8*5}{9*5} +\frac{11*3}{15*3}$ Since 15*3=45, multiply the top by 3 also. Since 9*5=45, multiply the top by 5 also.

$= -\frac{40}{45} +\frac{33}{45}$

$= \frac{-40+33}{45}$ Combine the fractions

$= -\frac{7}{45}$ Answer in lowest terms

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2 years ago

poizon [28]

Answer:

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Step-by-step explanation:

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2 years ago

Decrease £16855.21 by 13.5%<br> Give your answer rounded to 2 DP.

Savatey [412]

Answer:

Step-by-step explanation:

= £16855.21 - ( £16855.21 x <u>13.5% )</u>

100

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2 years ago

The formula E =1/2 kx^2gives the potential energy E of a spring with spring constant k that has

zaharov [31]

Answer:

$k = 2E/x^2$

Step-by-step explanation:

<u>Given formula:</u>

$E = 1/2kx^2$

<u>To solve for k, multiply both sides by 2 and divide by x²:</u>

$2E=kx^2$
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Natali5045456 [20]

Answer:

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Step-by-step explanation:

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