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Kruka [31]
3 years ago
10

The world's record in the 100 m dash is 9.69 seconds and in the 100 yard dash is 9.21 seconds.

Chemistry
2 answers:
Andrews [41]3 years ago
8 0
Speed is equivalent to the distance traveled divided by the time it takes to travel that certain distance. 
To solve this problem convert the units first from meter and yards to miles. 100 metes is 0.0621371mi and 100 yards is 0.0568182 yard. 9.69s = 0.002691667 hr and 9.21s = 0.002558333

A.) 23mi/hr
B.) 22.20mi/hr
inysia [295]3 years ago
7 0

Answer:

A) The speed of the runner is 23.085 mile/hr.

B) The speed of the runner is 22.209 mile/hr.

Explanation:

Speed=\frac{\text{Distance covered}}{\text{Time taken}}=\frac{D}{T}

A) Distance covered in 9.69 seconds = 100 m

1 mile = 1609.34 m

100 m =100\times \frac{1}{1609.34} miles=0.062137 miles

1 hour = 3600 seconds

9.69 s = 9.69\times \frac{1}{3600} hr=0.002691 hr

Speed of the runner = \frac{0.062137 mile}{0.002691 hr}=23.085 mile/hr

The speed of the runner is 23.085 mile/hr.

B) Distance covered in 9.21 seconds = 100 yards

1 mile = 1760 yards

100 yards =100\times \frac{1}{1760 } miles=0.05681 miles

1 hour = 3600 seconds

9.21 s = 9.21\times \frac{1}{3600} hr=0.0025583 hr

Speed of the runner = \frac{0.05681 mile}{0.0025583 hr}=22.209 miles/hr

The speed of the runner is 22.209 mile/hr.

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Andreyy89

I think it would be C.100.5cm or D.100.5ml hope that helps


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4 years ago
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Suppose you want to prepare a buffer with a pH of 4.59 using formic acid. What ratio of [sodium formate]/[formic acid) do you ne
katrin [286]

Answer:

7.08

Explanation:

To solve this problem we'll use the <em>Henderson-Hasselbach equation</em>:

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Where \frac{[A^-]}{[HA]} is the ratio of [sodium formate]/[formic acid] and pka is equal to -log(Ka), meaning that:

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We<u> input the data</u>:

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And<u> solve for </u>\frac{[A^-]}{[HA]}:

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3 0
3 years ago
Is my answer correct?
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How do i balance the first chemical reaction above?? plz plz help
soldier1979 [14.2K]

Answer:

2K +F₂→ 2KF

Explanation:

When we balance an equation, we are trying to ensure that the number of atoms of each element is the same on both sides of the arrow.

On the left side of the arrow, there is 1 K atom and 2 F atoms. On the right, there is 1 K and 1 F atom.

Since the number of K atoms is currently balanced, balance the number of F atoms.

K +F₂→ 2KF

Now, that the number of F atoms is balanced on both sides, check if the number of K atoms are balanced.

<u>Left</u>

K atoms: 1

F atoms: 2

<u>Right</u>

K atoms: 2

F atoms: 2

The number of K atoms is not balanced.

2K +F₂→ 2KF

<u>Left</u>

K atoms: 2

F atoms: 2

<u>Right</u>

K atoms: 2

F atoms: 2

The equation is now balanced.

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What are the variables of Boyle's law?
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