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ZanzabumX [31]
2 years ago
5

A collection of coins contains 14 pennies, 16 dimes, and 7 quarters. What is the percentage of pennies in the collection?A colle

ction of coins contains 14 pennies, 16 dimes, and 7 quarters. What is the percentage of pennies in the collection?
Chemistry
2 answers:
marin [14]2 years ago
8 0

Answer:

=37.83783784

Explanation:

Find the total sum of all coins,

which is 37, take the number of pennies and the total of all coins put in parenthesis( 14/37) like so and than * times them by 100

you equation should look like this

(14/37)* 100= and than the answer shown above should be the one you received. I have checked this with multiple calculators, it should be accurate.  

Nesterboy [21]2 years ago
7 0

Answer : The percentage of pennies in the collection is 37.84 %.

Explanation :

To calculate the percentage of pennies in the collection, we use the equation:

\text{Percentage of pennies}=\frac{\text{Coins of pennies}}{\text{Total number of coins}}\times 100

Given:

Number of coins of pennies = 14

Number of coins of dimes = 16

Number of coins of quarters = 7

Now we have to calculate the total number of coins.

Total number of coins = 14 + 16 + 7 = 37

Now we have to calculate the percentage of pennies in the collection.

\text{Percentage of pennies}=\frac{14}{37}\times 100=37.84\%

Hence, the percentage of pennies in the collection is 37.84 %.

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Answer:

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Speed of boy just before hitting the ground is 7.67 m/s

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Explanation:

Given that:

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Height, h = 10ft = 3m

To find:

Kinetic energy of boy when he hits the ground.

<em>As per law of conservation of energy The potential energy gets converted to kinetic energy.</em>

<em></em>

<em></em>\therefore<em> </em>Kinetic energy at the time boy hits the ground = Initial potential energy of the boy when he was at the Height 'h'

The formula for potential energy is given as:

PE = mgh

Where m is the mass

g is the acceleration due to gravity, g = 9.8 m/s^2

h is the height of object

Putting all the values:

PE = 34 \times 9.8 \times 3 \approx 1000\ J

Hence, Kinetic energy is \approx1000 J.

Formula for Kinetic energy is:

KE = \dfrac{1}{2}mv^2

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Putting the values and finding v:

1000 = \dfrac{1}{2}\times 34 \times v^2\\\Rightarrow v^2 = 58.82\\\Rightarrow v = 7.67\ m/s

Given that:

1 m = 1.094 yd and 1 mi = 1760 yd

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Which gas tank will empty first? acetylene (C2H2) oxygen (O2)
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Answer:

The standard heat of formation of Compound X at 25°C is -3095.75 kJ/mol.

Explanation:

Mass of compound X = 7.00 g

Moles of compound X = \frac{7.00 g}{70 g/mol}=0.100 mol

Mass of water in calorimeter ,m= 35.00 kg = 35000 g

Change in temperature of the water in calorimeter = ΔT

ΔT = 2.113°C

Specific heat capacity of water ,c= 4.186 J/g °C

Q =  m × c × ΔT

Q=35000 g\times 4.186 J/g ^oC\times 2.113^oC=309,575.6 J=309.575 kJ

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A food worker had safely cooled a large pot of soup to 70 F (21 C) with two hours. What temperature must the soup Reach in the f
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The temperature reached after four hours of cooling is 140 F (or) 42 C.

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∴ The temperature reached in four hours= 2(70)= 140 F (or) 2(21)= 42 C

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