Subject Experts Solutions for Chapter: Exponents and Powers, Exercise 2: Worksheet 2

Mass of the earth is $5.97\times {10}^{24} \mathrm{kg}$ and the mass of the moon is $7.35\times {10}^{22}$ $\mathrm{kg}$. What is the sum of their masses? Which one has less mass?

The mass of one atom of titanium and lead are $7.95\times {10}^{-26} \mathrm{kg}$ kg and $3.44\times {10}^{-25} \mathrm{kg}$ respectively. What is the sum of their masses and which atom has greater mass?

The difference between $0.000265 \mathrm{m}$ and $0.0000365 \mathrm{m}$ is $2.285\times {10}^{-5} \mathrm{m}$.

In a stack, if there are $6$ books, each of thickness $40 \mathrm{mm}$, then the total thickness of the stack in $k mm$. Find the value of $k$.

A stack having $12$ books, each of thickness $20 \mathrm{mm}$ and $10$ books of thickness $150 \mathrm{mm}$. The total thickness of the stack in $k mm$. Find the value of $k$.

In a shelf, there are $15$ books each of thickness $10 \mathrm{mm}$ and $25$ paper sheets, each of thickness $0.010 \mathrm{mm}$. If the total thickness of the shelf can be expressed in standard form as $a\times {10}^b \mathrm{mm}$, where $b=2$ find $a$.

A shelf having a total thickness of the books as $2.42\times {10}^2 \mathrm{mm}$. If $6$ books each of thickness $25 \mathrm{mm}$ are taken out of the $20$ books. Then find the thickness of each of the remaining books which are equal in thickness.

If the total thickness of a stack having $15$ books, each of thickness $30 \mathrm{mm}$ and $15$ paper sheets, each of thickness $0.026 \mathrm{mm}$ is $4.5039\times {10}^k \mathrm{mm}$, then the value of $k$ is