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Korolek [52]
3 years ago
7

a ceiling fan is rotating at 0.96 rev/sec. when turned off, it slows uniformly to a stop in 2.4 min. How many revolutions does t

he fan make in this time? Can anyone help me with this question?
Mathematics
1 answer:
Mrrafil [7]3 years ago
3 0
When the decrease in velocity (the acceleration) is uniform, the average velocity is [Initial velocity - Final velocity]/2

We know tha the initial velocity is 0.96 rev / sec and the final velocity is 0,

Then, the average velocity is  [0.96 / 2 ]rev /sec = 0.48 rev/sec.

Also, by defintion,

average velocity = number of  rev / time,

From which, number of rev = average velocity *  time

So, number of rev = 0.48 rev/sec * 2.4 min * 60sec /min = 69.12 rev

Answer: 69.12 revolutions
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If the ratio of men to women is 3:2 and there are 120 men, how many women would there be?
zavuch27 [327]
There would be 80 women.
Here's the work:
120 divided by 3 = 40 
If the ratio is 3:2, there is always one less woman then men, so you subtract the 40 men in a group and you get your answer of 80

Hope I helped!! :)
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3 years ago
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4 0
3 years ago
If you have $45 and they take 2.1% of it how much do you have left ?
IRINA_888 [86]
First you need to make a multiplier for 100-2.1%, to do this you minus the values and divide it by 100:
100-2.1 = 97.9
97.9/100 = 0.979

Then you multiply all the questions by it:
$45 * 0.979 = $44.055
$765 * 0.979 = $748.935
$1300 * 0.979 = $1272.7

Hope this helps! :)
3 0
3 years ago
can someone help me immediately!! i’m not even joking i need ur help now. DO NOT GUESS OR LEAVE A LINK. correct answer gets brai
marusya05 [52]

Answer:

d.

Step-by-step explanation:

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5 0
3 years ago
(15.2*0.25-48.51/14.7)/x=(13/44-2/11-5/66/2.50)1.2/(3.2+0.8(5.5-3.25)
goldfiish [28.3K]

Answer:

x = 41.67

Step-by-step explanation:

The above equation, would be simplified or divided into parts;

Therefore, the given equation becomes;

A/x = B/C

Where;

A = (15.2*0.25-48.51/14.7)

B = (13/44-2/11-5/66/2.50)1.2

C = 3.2+0.8(5.5-3.25)

x = unknown variable.

<u>Part A</u>

(15.2*0.25-48.51/14.7) = (15.2*0.25 - 3.3)

A = (3.8 - 3.3)

A = 0.5

<u>Part B</u>

(13/44-2/11-5/66/2.50)1.2 = (0.3 - 0.18 - 0.030) * 1.2

B = 0.09 * 1.2

B = 0.108

<u>Part C</u>

(3.2+0.8(5.5-3.25)

C = 4*(2.25)

C = 9

<em>Substituting the values into the equation, we have;</em>

0.5/x = 0.108/9

<em>Cross-multiplying, we have;</em>

9 * 0.5 = 0.108x

4.5 = 0.108x

x = 4.5/0.108

x = 41.67

6 0
3 years ago
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