Nose

Answer each question by calculating for the missing variable. Be sure to show all calculation work.

1. You must exert a force of 4.5 N on a book to slideit across a table. If you do 2.7 (J) of work in the process, how far have you moved the book?

2. If 16,700 J of work is done to shoot the human cannonballdown a 3.05 m barrel, then how much force is applied to the person to fire them out the cannon?

3. A 190,000 W engine can accelerate from rest to a top speedin 9 s. How much work did the engine do?

4. How far can a mother push a baby carriage, using a force of 62 N, if she can only do 2920 J of work?

5.How much work is it to lift a 20 kg sack of potatoes vertically 6.5 m?

6. A cat which weighs 40N climbs a tree that is 1500cm tall in 10 seconds. Calculatethe work done bythe cat and the cat’s power.

7. Complete the table below:

Force (N) | Distance (m) | Time (sec) | Work (J) | Power (W) |
100 | 2 | 5 || |
100 | 2 | 10 | | |
100 | 4 | 10 | | |
100 | | 25 | 500 | |
| 20 | 20 | 1000 | |
| 30 | 10 | | 60 |
9 | 20 | | | 60 |
3 | | | 75 |5 |

8. The power of a typical adult’s body over the course of a day is 100 watts. This means that 100 joules of energy from food are needed each second.(a) An average apple contains 500,000 joules of energy. For how many seconds would an apple power a person?
(b) How many joules are needed each day?(c) How many apples would a person need to eat to get enough energy for one day?

AllScience Take Home Class Activities should be presented in your HOMEWORK FILE