1. A kind of metal is cut into a square cube with each side equals `1.0 cm`, the mass of this cube is `41.0\ g`, what is the density of this mterial?
View Detail ...
2. How many significant figures are in the following numbers? (a) `78.9 +- 0.2` (b) `3.788 times 10^9` (c) `2.46 times 10^(-6)` (d) `0.0053`
View Detail ...
3. Convert following number into scientific notation format. (a)1277 (b)0.0031 (c)210000 (3 significant figures) (b) 0.0400
View Detail ...
4. Calculate following equations with correct significant figures. (a) `0.31 +0.011` (b) `0.001- 0.50` (c) `4.11 times 10^(5) + 3.0 times 10^(6)` (d) `1.30 times 10^(-7) -1.00 times 10^(-8)`
View Detail ...
5. Calculate following equations with correct significant figures. (a) `3.0 times 0.011` (b) `0.0055 / 0.5` (c) `(1.11 times 10^(5)) times (3.0 times10^(6))` (d) `(1.22 times 10^(-7)) / (1.0 times 10^(-8))`
View Detail ...
6. The density of water is `1.0 times 10^3\ kg//m^3`. A swimming pool need `4.51 times 10^4\ kg ` water to full it up. What is the volume of this swimming pool?
View Detail ...