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nasty-shy [4]
3 years ago
5

The weight of a synthetic ball varies directly with the cube of its radius. a ball with a radius of 2 inches weighs 1.60 pounds.

find the weight of a ball of the same material with a​ 3-inch radius.
Mathematics
1 answer:
kiruha [24]3 years ago
6 0
Quick answer: 5.4 pounds for a ball 3" in radius.
Remark
You are expected to do this by calling 4/3*pi = some constant k

Givens
r = 2 inches
r1 = 3 inches

Ratio
\frac{W1}{W2} =  \frac{k r^3}{k (r1)^3}

Sub and solve 
Begin by cancelling out the ks.
\frac{W1}{W2} = \frac{r^3}{(r1)^3}

Next substitute for the 2 rs.
\frac{W1}{W2} = \frac{2^3}{3^3}

Now expand the 2 cubic amounts.
\frac{W1}{W2} = \frac{8}{27}

Conclusion Part One
The ratio of the two weights is 8/27

Part Two
Set up the ratio for 1.6 pounds to x
\frac{8}{27} = \frac{1.6}{x}

Cross multiply
8*x = 27 * 1.6  Combine the right side.
8x = 43.2    Divide by 8
x = 43.2 / 8
x = 5.4 pounds.    

If you take physics, you will do this quite frequently.
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Step-by-step explanation:

<u><em>The correct question is</em></u>

How many favorable outcomes are expressed in the fraction 5/12

we know that

The probability of an event is the ratio of the size of the event space to the size of the sample space.  

The size of the event space is the number of outcomes in the event you are interested in or the number of favorable outcomes

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