3 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]3 years ago

8 0

Answer:

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

Step-by-step explanation:

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

You might be interested in

Question 4<br> What is the y-intercept of the line?

grandymaker [24]

Answer:

Step-by-step explanation:

the line crosses the y-axis at the point (0, 1), which is a y-intercept because x=0, so the y-intercept would be 1

5 0

3 years ago

Find: (4x2y3 + 2xy2 – 2y) – (–7x2y3 + 6xy2 – 2y) Place the correct coefficients in the difference.

DanielleElmas [232]

Answer: Our required answer will be

$11x^2y^3-4xy^2$

Step-by-step explanation:

Since we have given that

$(4x^y^3+2xy^2-2y)-(-7x^2y^3+6xy^2-2y)$

We need to get the difference:

1) We first open the second bracket and make appropriate change in signs :

$4x^y^3+2xy^2-2y+7x^2y^3-6xy^2+2y$

2) Gather the like terms together :

$4x^2y^3+2xy^2-2y+7x^2y^3-6xy^2+2y\\\\=4x^2y^3+7x^2y^3+2xy^2-6xy^2-2y+2y\\\\=11x^2y^3-4xy^2$

Hence, our required answer will be

$11x^2y^3-4xy^2$

5 0

3 years ago

Read 2 more answers

Graph the inequality B is greater than -3

nikdorinn [45]

The graph would be a shaded line all inclusive after -3

4 0

3 years ago

Between which two consecutive whole numbers does the square root of 7 lie

Montano1993 [528]

Hmm

7
look at perfect squer befre and after
4=2^2
9=3^2

4<7<9
therefor
√4<√7<√9
2<√7<3

between 2 and 3

8 0

3 years ago

Negative number on a number line 2

Montano1993 [528]

I am pretty sure it is Point D

5 0

2 years ago

Read 2 more answers