The world's record in the 100 m dash is 9.69 seconds and in the 100 yard dash is 9.21 seconds. A) find the speed in mi/h of the runner who set the record of 9.69 seconds.
B) find the speed in mi/h of the runner who set the record of 9.21 seconds.

Answers

Answer 1

Answer: 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

Answer 2

Answer:

Answer:

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

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

Explanation:

$Speed=\frac{\text{Distance covered}}{\text{Time taken}}=(D)/(T)$

A) Distance covered in 9.69 seconds = 100 m

1 mile = 1609.34 m

$100 m =100* (1)/(1609.34) miles=0.062137 miles$

1 hour = 3600 seconds

9.69 s = $9.69* (1)/(3600) hr=0.002691 hr$

Speed of the runner = $(0.062137 mile)/(0.002691 hr)=23.085 mile/hr$

The speed of the runner is 23.085 mile/hr.

B) Distance covered in 9.21 seconds = 100 yards

1 mile = 1760 yards

$100 yards =100* (1)/(1760 ) miles=0.05681 miles$

1 hour = 3600 seconds

9.21 s = $9.21* (1)/(3600) hr=0.0025583 hr$

Speed of the runner = $(0.05681 mile)/(0.0025583 hr)=22.209 miles/hr$

The speed of the runner is 22.209 mile/hr.

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A weather forecast differs from the weather report in that the weather forecast is the application of science and technology to predict the state of the atmosphere for a given location; whereas the weather report is a systematic statement of the existing and usually the predicted meteorological conditions over a particular area.

Which of these formulas contains the most polar bond?
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Answers

The answer is H—F. Fluorine is the most electronegative of the four halogens (and, in fact, of all the elements), so it does the best job of gathering the shared electrons to itself. Therefore, the bond with F is the most polar

Help please more points1 Change 9.0 x 10^7 from scientific to standard notation

2 Change 3.2 x 10^-5 from scientific to standard notation

3 Which types of measurements are appropriate for scientific notation? *

The speed of light

The speed of a snail

The speed of your car

4 Write 0.0000000000372 grams in scientific notation. Then convert to SI base units.

5 Write 45,000,000,000 kilometers in scientific notation. Then convert your answer to SI base units

6 A bulb thermometer gives an indoor temperature reading of 21 degrees Celsius. A digital thermometer in the same room gives a reading of 20.7 degrees Celsius. Which devise is more precise? Explain.

Answers

Answer:

The answers are below

Explanation:

1.- Change 9.0 x 10^7 from scientific to standard notation

Just move the decimal point 7 places to the right

90000000

2 Change 3.2 x 10^-5 from scientific to standard notation

Just move the decimal point 5 places to the left

0.000032

3 Which types of measurements are appropriate for scientific notation? *

The speed of light is appropriate

The speed of a snail isn't appropriate

The speed of your car isn't appropriate

4 Write 0.0000000000372 grams in scientific notation. Then convert to SI base units.

Just move the decimal point 11 places to the right

3.72 x 10 ⁻¹¹ grams = 3.72 x 10 ⁻¹⁴ kg

5 Write 45,000,000,000 kilometers in scientific notation. Then convert your answer to SI base units

Just move the decimal point 10 places to the left

4.5 x 10 ¹⁰ km = 4.5 x 10¹³ m

6 A bulb thermometer gives an indoor temperature reading of 21 degrees Celsius. A digital thermometer in the same room gives a reading of 20.7 degrees Celsius. Which devise is more precise? Explain.

I think the digital thermometer is more precise because it can measure decimals, then the reading is closer to the right temperature. The other thermometer can't read decimals.

The recommended daily requirement of calcium is1,000 mg. Tap water in a Midwestern city contains approximately 150 mgCa/L. A person living in the city who drinks two liters of water in oneday would receive ________ percent of his/her RDA of calcium. A. 3
B. 7.5
C. 15
D. 30

Answers

The answer is D. 30 percent

What is the theoretical yield of sodium oxide (Na₂O) in grams when 20.0g of calcium oxide (CaO) reacts with an excess amount of Sodium chloride? *10 points
Captionless Image
10.0g
22.1g
32.9g
5.6g

Answers

Answer:

22.1 g

Explanation:

The balanced reaction equation which serves as a guide in solving the problem is given as;

CaO(s) + 2NaCl(aq) ------> Na2O(s) + CaCl2(aq)

The question clearly specifies that sodium chloride is the reactant in excess. This means that calcium oxide should be used to calculate the theoretical yield of sodium oxide.

Number of moles of calcium oxide reacted = mass of calcium oxide / molar mass of calcium oxide

Molar mass of calcium oxide = 56.0774 g/mol

Mass of calcium oxide = 20.0g

Number of moles of calcium oxide = 20.0 g/ 56.0774 g/mol = 0.3566 moles

From the balanced reaction equation;

1 mole of calcium oxide produces 1 mole of sodium oxide

Therefore, 0.3566 moles of calcium oxide will produce 0.3566 moles of sodium oxide.

Mass of sodium oxide produced = number of moles × molar mass

Molar mass of sodium oxide= 61.9789 g/mol

Mass of sodium oxide = 0.3566 moles × 61.9789 g/mol

Mass of sodium oxide= 22.1 g

Answer:

22.1g

Explanation:

We'll begin by writing the balanced equation for the reaction. This is given below:

CaO + 2NaCl —> Na2O + CaCl2

Next, we shall determine the mass of CaO that reacted and the mass of Na2O produced from the balanced equation.

This is illustrated below:

Molar mass of CaO = 40 + 16 = 56g/mol

Mass of CaO from the balanced equation = 1 x 56 = 56g

Molar mass of Na2O = (23x2) + 16 = 62g/mol

Mass of Na2O from the balanced equation = 1 x 62 = 62g

From the balanced equation above,

56g of CaO reacted to produce 62g of Na2O.

Finally, we can determine the theoretical yield of Na2O as follow:

From the balanced equation above,

56g of CaO reacted to produce 62g of Na2O.

Therefore, 20g of CaO will react to produce = (20 x 62)/56 = 22.1g of Na2O.

Therefore, the theoretical yield of Na2O is 22.1g

Which 5.0-milliliter sample of NH3 will take the shape of and completely fill a closed 100.0-milliliter container?(1) NH3(s) (3) NH3(g)(2) NH3(ℓ) (4)NH3(aq)

Answers

Final answer:

The NH3 sample that will fill and take the shape of a 100.0-milliliter container is NH3(g). Gases such as NH3(g) expand to fill their container, as explained by the ideal gas law and Avogadro's law.

Explanation:

To answer your question about NH3, we need to consider each of the states of matter. Hence, the answer is (3) NH3(g). This is because of the properties that gases have, including the ability to fully expand and take the shape of their container regardless of the volume of the container.

Specifically, any gaseous substance, such as NH3(g), expands to fill its container due to the kinetic energy of the gas molecules and their relatively far-apart spacing compared to solids and liquids. Even a small amount of gas can completely fill even a relatively large container. This phenomenon is due to one of the main gas laws, the ideal gas law, and the properties of gases as stipulated by Avogadro's law that equal volumes of gaseous N₂, H₂, and NH3, at the same temperature and pressure, contain the same number of molecules.

This concept is fundamental in the stoichiometry of gaseous substances and Dalton's law of partial pressures, which states that the total pressure exerted by a mixture of gases is equal to the sum of the pressures that each would exert if it were present alone and occupied the same volume.