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vfiekz [6]
3 years ago
11

a string of holiday lights at a store have three colors that flash at different times. red lights flash every fifth second. blue

lights flash every third second. green lights flash every four seconds. the store owner turns on the lights. After how many seconds Will all three lights flash at the same time for the first time?
Mathematics
1 answer:
FinnZ [79.3K]3 years ago
7 0
The highest common factor of 5, 3, and 4 is 60, so therefore the lights will flash at the same time after 60 seconds.
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The region in the first quadrant bounded by the x-axis, the line x = ln(π), and the curve y = sin(e^x) is rotated about the x-ax
charle [14.2K]
First, it would be good to know that the area bounded by the curve and the x-axis is convergent to begin with.

\displaystyle\int_{-\infty}^{\ln\pi}\sin(e^x)\,\mathrm dx

Let u=e^x, so that \mathrm dx=\dfrac{\mathrm du}u, and the integral is equivalent to

\displaystyle\int_{u=0}^{u=\pi}\frac{\sin u}u\,\mathrm du

The integrand is continuous everywhere except u=0, but that's okay because we have \lim\limits_{u\to0^+}\frac{\sin u}u=1. This means the integral is convergent - great! (Moreover, there's a special function designed to handle this sort of integral, aptly named the "sine integral function".)

Now, to compute the volume. Via the disk method, we have a volume given by the integral

\displaystyle\pi\int_{-\infty}^{\ln\pi}\sin^2(e^x)\,\mathrm dx

By the same substitution as before, we can write this as

\displaystyle\pi\int_0^\pi\frac{\sin^2u}u\,\mathrm du

The half-angle identity for sine allows us to rewrite as

\displaystyle\pi\int_0^\pi\frac{1-\cos2u}{2u}\,\mathrm du

and replacing v=2u, \dfrac{\mathrm dv}2=\mathrm du, we have

\displaystyle\frac\pi2\int_0^{2\pi}\frac{1-\cos v}v\,\mathrm dv

Like the previous, this require a special function in order to express it in a closed form. You would find that its value is

\dfrac\pi2(\gamma-\mbox{Ci}(2\pi)+\ln(2\pi))

where \gamma is the Euler-Mascheroni constant and \mbox{Ci} denotes the cosine integral function.
5 0
4 years ago
What expression represents the volume of the cone, in
denis23 [38]

The expression that represents the volume of the given cone, in cubic units is 2/3 πx³.

<h3>How to calculate the volume of the cone?</h3>

The volume of a cone with radius 'r' and slant height 'h' is

V = 1/3 π r² h

Unit: cubic units

<h3>Calculation:</h3>

The given cone has radius r = x and height h = 2x

Then, the volume of the cone is calculated by

V = 1/3 π r² h

   = 1/3 π x² (2x)

   = 2/3 π x³ cubic units

Therefore, the volume of the given cone is V = 2/3 π x³ cubic units.

So, option A is correct.

Learn more about the volume of a cone here:

brainly.com/question/13677400

#SPJ9

Disclaimer: The given question on the portal is incomplete. Here is the complete question.

Question: What expression represents the volume of the cone, in cubic units?

A) 2/3 πx³

B) 4/3 πx²

C) 2πx³

D) 4πx³

8 0
2 years ago
What’s the prime factorization of 650
Arturiano [62]
The exponents in the prime factorization are, 1, 2, and 1.
4 0
3 years ago
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How many milliliters is in 50 liters of gas
mojhsa [17]
50000 millilitres Is in 50 liters of gas.
8 0
4 years ago
write in point-slope form an eauation of the linr thag passes through the givin point and has the givin slope​
Tanya [424]
It’s hard to completely answer without a graph or coordinates, but I do believe that point slope form is y-y1=m(x-x1). Plug in your slope for m. After that, plug in your x coordinate in the appropriate place as well as your y coordinate. Solve from there
7 0
4 years ago
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