Читать книгу Physics - Willis E. Tower - Страница 30

1. Give an illustration of Hooke's Law from your own experience.

2. What devices make use of it?

3. Do solids evaporate. Give reasons.

4. When iron is welded, is cohesion or adhesion acting?

5. When a tin basin is soldered, is cohesion or adhesion acting?

6. Sometimes a spring is made more elastic by tempering and made soft by annealing. Look up the two terms. How is each accomplished?

7. Review the definitions: solid, liquid, and gas. Why do these definitions mean more to you now than formerly?

8. If a wire is stretched 0.3 cm. on applying 4 kg. of force, what force will stretch it 0.75 cm? Explain.

9. How long will it take under ordinary conditions for a gas molecule to cross a room? Give reasons for your answer.

10. What is meant by the elastic limit of a body?

11. Without reaching the elastic limit, if a beam is depressed 4 mm. under a load of 60 kg., what will be the depression under a load of 400 kg.? Of 600 kg.?

12. Name three substances that possess elasticity of volume.

13. Give three examples of each; elasticity of (1) compression, (2) stretching, (3) torsion, (4) flexure.