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3 years ago

A football field is about 100 m long. If it takes a person 20 seconds to run its length, how fast were they running ?

1 answer:

3 0

Hi Alex, thanks for asking a question here on Brainly!

We can figure how the fast the person is running by dividing the minutes by the seconds.

$\frac{5m}{sec}$
= $\frac{300m}{min}$
= $\frac{18km}{hr}$

The person was running 18 km/hr. ✅

Hope that helps! ★ If you have further questions about this question or need more help, feel free to comment below or post another question and send the link to me. -UnicornFudge aka Nadia.

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Classify the following as either an element, compound, homogeneous mixture or

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2 years ago

William adds two values , following the rules for using significant figures in computations. He should write the sum of these tw

yuradex [85]

Answer:

when it comes to adding or subtracting numbers, his final answer should have the same number of decimal places as the least precise value.

For example if you add 2 numbers; 10.443 + 3.5 , 10.443 has 3 decimal places and 3.5 has only one decimal place.

Therefore 3.5 is the less precise value.

So when adding these 2 values the final answer should have only one decimal place.

after adding we get 13.943 but it can have upto one decimal place. then the second decimal place is less than 5 so the answer should be rounded off to 13.9.

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Explanation:

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2 years ago

The mole fraction of NaCl in an

posledela

The weight/weight percent(%w/w) of NaCl in solution : 33.03%

<h3>Further explanation</h3>

Given

Mole fraction of NaCl : 0.132

Required

The weight/weight percent of NaCl

Solution

1 mol solution : 0.132 mol NaCl + 0.868 mol H₂O

mass NaCl :

$\tt 0.132\times 58.44 g/mol=7.714~g$

mass H₂O :

$\tt 0.868\times 18.016~g/mol=15.64~g$

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$\tt \%NaCl=\dfrac{7.714}{23.354}\times 100\%=33.03\%$

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2 years ago

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2 years ago

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2 years ago

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