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Vesnalui [34]
3 years ago
11

The power, P (watts) , of a car engine is proportional to the square of its speed, s ( m / s ) . When s = 30 , P = 1260 . Work o

ut the power when the speed is 25 m / s
Mathematics
1 answer:
Lapatulllka [165]3 years ago
6 0

Answer:

875 Watts

Step-by-step explanation:

Given that :

P α s²

P = ks²

Where k is the proportionality constant

When ; p = 1260 ; s = 30

1260 = k * 30²

1260 = 900k

k = 1260 / 900

k = 1.4

Value of p ; when s = 25

P = 1.4 * s²

P = 1.4 * 25²

P = 1.4 * 625

P = 875 watt

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A bicycle computer or cyclometer uses a magnet counter that records each wheel rotation to calculate the bike’s total distance t
CaHeK987 [17]

The simplest and probably the best way to understand this problem is to make up a problem that obeys what you have been given. It doesn't have to be realistic. It just has to obey the conditions. Let us suppose that you thought the diameter of the tire is 1 yard. That would mean the circumfrence is pi * d

C = 3.14 * 1

That would mean that the circumference is 3.14 yards. It would also mean that you would have to have the wheel turn 1760 yards / /3.14 yards / revolution which is about 561 revolutions / mile. So the way I have set up the problem, my equation is d = 561 * R where R is the number of revolutions.

Now let's see what happens when you say "O my Goodness, the wheel diameter is really 32 inches" which 0.8888888 yards  what happens now?

Now you still have to go 1760 yards How many revolutions is that?

C = pi * d

C = 3.14 * 0.88888888

C = 2.79111 yards

How many revolutions does it take to 1760 yards.

R = 1760 // 2.78111 yards / revolution

R = 631 revolutions / mile. What happened?

Your constant goes up if the wheel diameter goes down. Think about this. Do you ride a bicycle? I do. It makes perfect sense to me that if the wheel is small, it will have to turn more often to go a mile. No matter where that 0.00125 comes from or how it was derived, the constant will have to go up if the wheel gets smaller.


6 0
3 years ago
Whoever answers gets brainlist!
Valentin [98]

Answer:

d

Step-by-step explanation:

becuase 0.54166666666 is equal to it

6 0
2 years ago
Read 2 more answers
Help please!! will give brainiest :))
jeyben [28]

Answer:

81(x + 2y)(x - 2y)

Step-by-step explanation:

81 {x}^{2}  - 324 {y}^{2}  \\  \\  =  {(9x)}^{2}  -  {(18y)}^{2}  \\  \\  = (9x + 18y)(9x - 18y) \\  \\  = 9(x + 2y) \times 9(x - 2y) \\  \\  = 81(x + 2y)(x - 2y)

7 0
2 years ago
Read 2 more answers
A person 44​-ftft tall casts a shadow 1313​-ftft long. at the same​ time, a nearby tree casts a shadow 3434​-ftft long. find the
3241004551 [841]
The ratio of height : shadow =44/1313

Therefore height of the tree,x=3434*(44/1313)
=115.08 ft

If you meant 13 and 34 as the length of shadows respectively, then also x=115.08 ft
6 0
3 years ago
Which mixed number is equivalent to the improper fraction 23/6 ?
satela [25.4K]
<span>Which mixed number is equivalent to the improper fraction 23/6 ?

= 3 5/6</span>
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3 years ago
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