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 material?

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`

3. Convert following number into scientific notation format. (a)1277 (b)0.0031 (c)210000 (3 significant figures) (b) 0.0400

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)`

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))`

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?

7. A car drove into the highway. The driver accelerates the car from `8.0\ m//s` to `25.0\ m//s` in 10.0 seconds. What is the acceleration of the car?

8. The speed of an object is depicted in the following velocity-time graph. Determine the acceleration during interval `A`, `B` and `C`.

9. A car was initially at rest and started with an acceleration of `3.0 m //s^2`. How far did it traveled after 10.0 seconds?