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Indeed, they move in very much the same way as do points on the hour hand of a clock, but at about half the rate. 3 The Southern Cross, Musca, Carina, and Chameleon. About midnight late in February. T a k e n on a fixed-focus box camera using Kodak T r i - X . T i m e of exposure—calculated— about 56 minutes wait until half past two in the morning, you would find the Cross at last upright, as it is on the flag; it would be then very high in the southern sky. If you think that half past two in the morning is an inconvenient time to look for the upright Cross, take heart.

How would you go about it? Just looking at him and forming some impression of his strength and height may be of some help, but you would not be ready to say you knew much about his skill at tennis, until you had seen him in action. Now, to find out about matter, scientists try to observe it in action. How could you get matter into action ? Is there any way to make it perform so that you could find out more about it? Think about it for a minute or so . . 2—1 Did you think of doing any of these things— bending it, stretching it, scraping it, heating it, cooling it, adding acid to it, hammering it?

4. Describe what you understand to be the difference between the movement of the particles in water at 20 °C and at 80 °C. 11. A moth ball placed in clothing may completely disappear after some months. What becomes of its particles ? 5. What is happening to the movement of water particles during the evaporation of water from an open container? 12. Name the changes of state involved in the following processes:— 6. Why does water evaporate more rapidly from the surface in a wide shallow pan than from the mouth of a bottle with a narrow neck?

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Abridged Science for High School Students. The Nuclear Research Foundation School Certificate Integrated by H. Messel

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