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3 years ago

14

What type of simple machine is a vise and what does it do also what is a crow bar

1 answer:

mel-nik [20]3 years ago

4 0

A crow bar is a bar that help you lift thing up

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Use algebra tiles to model and solve 4x + 7 = 23.

Zinaida [17]

Easy multiply 4x4 then add 7 the you get the answer

7 0

3 years ago

A balloon is blowing up at a constant rate of 9 cubic centimeters per second. When the volume of the balloon is 2048/3 pi cubic

jekas [21]

Answer:

$\displaystyle \frac{dr}{dt}\approx 0,0112\ cm/sec$

Step-by-step explanation:

<u>Rates of Change as Derivatives</u>

If some variable V is a function of another variable r, we can compute the rate of change of one with respect to the other as the first derivative of V, or

$\displaystyle V'=\frac{dV}{dr}$

The volume of a sphere of radius r is

$\displaystyle V=\frac{4}{3}\pi r^3$

The volume of the balloon is growing at a rate of $9\ cm^3/sec$ . This can be written as

$\displaystyle \frac{dV}{dt}=9$

We need to compute the rate of change of the radius. Note that both the volume and the radius are functions of time, so we need to use the chain rule. Differentiating the volume with respect to t, we get

$\displaystyle \frac{dV}{dt}=\displaystyle \frac{dV}{dr}\displaystyle \frac{dr}{dt}$

$\displaystyle \frac{dV}{dt}=4\pi r^2 \frac{dr}{dt}$

solving for $\displaystyle \frac{dr}{dt}$

$\displaystyle \frac{dr}{dt}=\frac{\frac{dV}{dt}}{4\pi r^2}$

We need to find the value of r, which can be obtained by using the condition that in that exact time

$\displaystyle V=\frac{2048}{3}\pi\ cm^3$

$\displaystyle \frac{2048}{3}\pi=\frac{4}{3}\pi r^3$

Simplifying and isolating r

$\displaystyle r^3=512$

$\displaystyle r=\sqrt[3]{512}=8\ cm$

Replacing in the rate of change

$\displaystyle \frac{dr}{dt}=\frac{9}{4\pi 8^2}$

$\displaystyle \frac{dr}{dt}=\frac{9}{256\pi }$

$\displaystyle \frac{dr}{dt}\approx 0,0112\ cm/sec$

8 0

3 years ago

there are 28 students desks in ms.Johnson's .each desk measures 26.17 inches long.if you were to line up all the desks end-to-en

ryzh [129]

So, if there are 28 students desks, and each desk is 26.17 inches long...

You multiply 26.17 by 28, to see how long it is:

26.17 * 28 = 732.76

3 0

3 years ago

Which of the following does not describe slope?

kolbaska11 [484]

<span>a. A two-dimensional figure</span>

8 0

3 years ago

What is the difference of the fractions? 5/6 - 4/6

Aleks [24]

Answer

$--------------------------------------------$

$\frac{5}{6}-\frac{4}{6}$ = $\frac{1}{6}$

$0.8333333333$ - $0.6666666667$ = $0.1666666666$

$\frac{1}{6}$ = $0.1666666666$

$It's$ $\frac{1}{6}$ $because$ $5-4$ = $1$

$and$ $the$ $denominator$ $is$ $the$ $same.$

$So$ , $it's$ $\frac{1}{6}$

$--------------------------------------------$

<em>Hope this helps! <3</em>

$--------------------------------------------$

6 0

3 years ago