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:

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

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What is the value of 10P10

storchak [24]

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3 years ago

If f = 350i - 250j - 450k6 n and cable ab is 9 m long, determine the x, y, z coordinates of point a

ycow [4]

we know the length of the cable is 9m.
That means the magnitude of rAB=9m.
The unit vector, denoted u, is each of rAB divided by the magnitude.

u=(x/9i−y/9j−z/9k)

We can also figure out the unit vector of F.
u=(350i - 250j - 450k)/√(350² +(-250)² +(-450)²)
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Force F is directed from point A to B, then both unit vectors must be equal.

Therefore
(x/9i−y/9j−z/9k)=0.562i−0.401j−0.723k
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The answer is
the coordinates of point a
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3 years ago

Robin donated bags of grain that each weighed 40/3 pounds to the local food shelf. If the total weight of the grain was 160 poun

Novay_Z [31]

Answer:

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Step-by-step explanation:

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2 years ago

The number of major earthquakes in a year is approximately normally distributed with a mean of 20.8 and a standard deviation of

SCORPION-xisa [38]

Answer:

a) 51.60% probability that in a given year there will be less than 21 earthquakes.

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Step-by-step explanation:

Problems of normally distributed samples can be solved using the z-score formula.

In a set with mean $\mu$ and standard deviation $\sigma$ , the zscore of a measure X is given by:

$Z = \frac{X - \mu}{\sigma}$

The Z-score measures how many standard deviations the measure is from the mean. After finding the Z-score, we look at the z-score table and find the p-value associated with this z-score. This p-value is the probability that the value of the measure is smaller than X, that is, the percentile of X. Subtracting 1 by the pvalue, we get the probability that the value of the measure is greater than X.

In this problem, we have that:

$\mu = 20.8, \sigma = 4.5$