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Murljashka [212]
3 years ago
14

The moon has a mass of 7.35×10^22 KG while earth has a mass of 5.97×10^24 KG what is the combined mass of the earth and moon

Mathematics
1 answer:
vladimir1956 [14]3 years ago
7 0

The combined mass of earth and moon is 6.0435 \times 10^{24} kg

<em><u>Solution:</u></em>

Given that moon has a mass of 7.35 \times 10^{22} kg while the earth has mass of 5.97 \times 10^{24} kg

To find: combined mass of earth and moon

From given question,

mass of earth = 5.97 \times 10^{24} kg

mass of moon = 7.35 \times 10^{22} kg

Combined mass = mass of earth + mass of moon

Substituting the values we get,

\text{ Combined mass } = 5.97 \times 10^{24} + 7.35 \times 10^{22}

Make both the exponents same

Move the decimal point two times left in 7.35 \times 10^{22} and increase the exponent to 10^{24}

\text{ Combined mass } = 5.97 \times 10^{24} + 0.0735 \times 10^{24}\\

Take 10^{24} as common term

\text{ Combined mass } = 10^{24} (5.97 + 0.0735)\\\\\text{ Combined mass } = 6.0435 \times 10^{24}

Thus combined mass of earth and moon is 6.0435 \times 10^{24} kg

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On the 1st January 2014 Carol invested some money in a bank account.
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Answer:

\large \boxed{\text{\pounds 23 360.00}}

Step-by-step explanation:

The formula for the accrued amount from compound interest is

A = P \left(1 + \dfrac{r}{n}\right)^{nt}

1. Amount in account on 1 Jan 2015

(a) Data:

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r = 2.5 %

n = 1

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(b) Calculations:  

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\begin{array}{rcl}23517.60 & = & P\left (1 + \dfrac{r}{n}\right)^{nt}\\\\& = & P\left (1 + \dfrac{0.025}{1}\right)^{1\times1}\\\\& = & P (1 + 0.025)\\ & = & 1.025 P\\P & = & \dfrac{23517.60 }{1.025} \\\\& = & 22 944.00 \\\end{array}

The amount that gathered interest was £22 944.00 but, before the interest started accruing, Carol had withdrawn £1000 from the account.

She must have had £23 944 in her account on 1 Jan 2015.

(2) Amount originally invested

(a) Data

A = £23 944.00

\begin{array}{rcl}23 944.00 & = & 1.025 P\\P & = & \dfrac{23 944.00 }{1.025} \\\\& = & \mathbf{23 360.00} \\\end{array}\\\text{Carol originally invested $\large \boxed{\textbf{\pounds23 360.00}}$ in her account.}

3. Summary

1 Jan 2014      P = £23 360.00

1 Jan 2015     A =    23 944.00

     Withdrawal = <u>    -1  000.00 </u>

                     P =     22 944.00

1 Jan 2016    A =    £23 517.60

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