phy 108 questions

problems

1. What are the three basic physical quantities and their units?

2. Convert 325.8 gram into kilogram and milligram.

3. Write the following numbers in scientific notation: 2,100; 6,500,000; 0.00012.

4. Knowing 1 ft=12 inch and 1 inch = 2.54 cm, 1 m = _______________ ft.

5. Convert the speed of 60 mph to the corresponding speed with units km/h and m/s, respectively.

1. A walker covers 1.8 km in a time of 30 minutes. What’s his average speed in m/s?

2. A car ran at a speed of 20 m/s for 10 minutes. What’s the distance it traveled?

3. A train achieves a velocity of 30 m/s from rest in 2 seconds. What’s its acceleration?

4. A car travels with an initial velocity of 12 m/s and acceleration of 2.5 m/s² for a time of 2 seconds.

a) What’s its speed at the end of this time?

b) What distance does it travel during this time?

5. A car is moving at velocity V₀=30 m/s. It starts to slow down with an acceleration -2m/s.

a) How long will it take to stop?

b) What distance does it travel during this time?