625 revolutions in 223 seconds Find the unit rate.

Mathematics

1 answer:

krok68 [10]3 years ago

7 0

Answer:

2.802691 revolutions per second

Step-by-step explanation:

You can round to the nearest whole number making it 3 revolutions per second

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Calculate the volume of water in the cup when it is full

maxonik [38]

To find:

The volume of the water in the cup when it is full.

Solution:

The volume of the water is equal to the difference of the volume of the small cone and the larger cone.

Here, the ratio of the radius of both cones is equal to the ratio of their heights. SO,

$\begin{gathered} \frac{r}{2.7}=\frac{20}{20-8} \\ \frac{r}{2.7}=\frac{20}{12} \\ \frac{r}{2.7}=\frac{5}{3} \\ r=4.5 \end{gathered}$

The radius of the larger cone is 4.5 cm.

So, the volume of the water is:

$\begin{gathered} V=\frac{1}{3}\pi R^2H-\frac{1}{3}\pi r^2h \\ =\frac{1}{3}\pi(R^2H-r^2h) \\ =\frac{1}{3}\pi((4.5)^2(20)-(2.7)^2(12)) \\ =\frac{1}{3}\cdot\frac{22}{7}(405-87.48) \\ =\frac{22}{21}(317.52) \\ =332.64cm^2 \end{gathered}$

The volume of water when the cup is full is 332.64 cm^2.

7 0

1 year ago

I need help on this question I need the answer please

SCORPION-xisa [38]

Answer: -1
Explanation: I'm not completely sure but I think you just have to substitute x with 1

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2 years ago

Please answer 7 and 8 for mark as brainliest

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7) A. A variable is an unknown value, and x is unknown. Constants are known values so they cannot have X in it.

8)A again for the same reason as number 7

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Alla [95]

Dang that’s crazy, send me some pics and you got a deal

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