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lys-0071 [83]
3 years ago
6

How long in hours would it take a runner to finish an 11 km race if she is running at a pace of 5.7 mi/hr?

Chemistry
2 answers:
Alenkinab [10]3 years ago
6 0

It would take 1.16 h for the runner to finish the race .

<em>Step 1. </em>Convert <em>kilometres to miles</em>.

11 km × (0.621 mi/1 km) = 6.83 mi

<em>Step 2</em>. Calculate the <em>time</em>.

Time = 6.83 mi × (1 h/5.7 mi) = 1.16 h

Oliga [24]3 years ago
5 0

Answer:  1.199 hour runner will require to cover the 11 km .

Explanation:

Distance covered by  runner = 11 km = 11 × 0.6213 miles = 6.8343 miles

1 km = 0.6213 mile

Speed of the runner = 5.7 mile/hour

speed=\frac{distance}{time}

5.7 mile/hour=\frac{6.8343 miles}{time}

time=\frac{6.8343 miles}{5.7 mile/hour}=1.199 hour

1.199 hour runner will require to cover the 11 km .

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Solution: Sentence D is a scientific statement.

Scientific statement is a statement that defines the science behind any situation. There should be any experimental result or observation to state any scientific statement. Also, the statement should be accepted by considering other scientific aspects.

Here, statement A can not be a scientific statement as different aromas of cooked food are liked by different people. Any one can find aroma of cooked food in copper better than the ceramic pot.

Thus, the statement can be proved wrong easily.

Statement B can not be a scientific statement as people can find the taste of normal water (without ice cubes) better than the ice cold water.

Statement C is not a scientific statement as there is no science behind watching baseball or ice hockey, it depends on the liking of today's people.

Statement D is a scientific statement because this can be scientifically proved.  

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3 years ago
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KatRina [158]

The answers would be:

In a solution, the solvent is present in a greater amount.

In a solutions, the solute dissolves in a solvent.

In general, these are the best answers. The solute is what is being dissolved and the solvent is what dissolves. A solvent comes in greater amounts in a solution and it is the dissolving agent.

For example, sugar and water.

To make a sugar water solution, you will need to dissolve sugar in water. Sugar is the solute in this case because it is what is being dissolved. The water is the solvent, because it dissolves the sugar.

If you had more sugar than water, then you cannot make a solution.  

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If there is a graduated cylinder containing 20mL of water and a small rock is gently placed inside it, and the water level insid
LekaFEV [45]

Answer:

5

Explanation:

just subtract 20-25 and 5 is left over which is how much the water when up with the rock.

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__________ could be the formula of an alkene. a. c3h8 b. c2h8 c. c6h6 d. c3h6 e. c17h36
drek231 [11]

The general formula for alkenes is CnH2n, the formula with hydrogen count double the carbon count should be the correct formula for alkene and that is d. C3H6.

What are alkenes?

Alkenes, commonly known as olefins, are organic unsaturated hydrocarbons that have one or more carbon-carbon double bonds in their chemical structure and are composed of carbon and hydrogen atoms.

Alkenes are unsaturated hydrocarbons with a double bond between the carbon atoms. Carbon atoms are connected by at least one double bond. The general formula for alkenes is C n H 2n. Olefin is frequently substituted with alkenes. The word "olefin" comes from the Greek phrase "olefin gas," which denotes the production of oil.

<u>Since, their general formula is CnH2n, the formula with hydrogen count double the carbon count should be the correct formula for alkene and that is d. C3H6.</u>

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Answer : The pressure of gas will be, 3.918 atm and the combined gas law is used for this problem.

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Combined gas law is the combination of Boyle's law, Charles's law and Gay-Lussac's law.

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V_1 = initial volume of gas = 1.40 L

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Now put all the given values in the above equation, we get the final pressure of gas.

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