| [ sciEncE ] in KIDS 글 쓴 이(By): jkal (일프로) 날 짜 (Date): 2003년 12월 7일 일요일 오후 05시 22분 58초 제 목(Title): [물리 OX 퀴즈 질문] 물리 O,X 퀴즈인데요… 답변 좀 부탁드릴께요. 물리학도 여러분의 도움을 부탁드립니다. 고맙습니다. 1. The person who carries a book up a flight of stair by running does the same work as one who carries the book up the same flight by walking. However, the first person uses more power. 2. Two billiard balls collide and make a noise. The collision is elastic. 3. Conservation of momentum, when applied to a situation correctly, will tell you exactly what whill happen. 4. Potential energy can never be negative. 5. I can change 100% of mechanical energy to heat. I can also change 100% of heat to mechanical energy. 6. As the ice on a lake becomes thicker, it slows down the heat lost by the lake due to convection. 7. In the morning in the summer, ocean breezes flow in toward shore because the ocean water heats up slower than the ground on shore heats up. 8. Freezing water (at zero degrees centigrade) has the same kinetic energy as ice at zero degrees centigrade, but more potential energy. 9. The first law of thermodynamics is the same as the law of conservation of energy. 10. The heat added to a liquid to change it to a gas becomes kinetic energy of the gas particles. 11. Water would make a good heat insulator. 12. Clothing can protect a person against alpha-particles radiation. 13. Alpha-particle radiation is the most dangerous kind of nuclear radiation. 14. Energy is released in both fission and fusion because intermediate mass nuclei have higher binding energies. 15. Fission involves a reaction between two light nuclei. 16. The atomic mass number is the number of protons in a nucleus. 17. The atomic number is the number of protons in a nucleus. It also determines which chemical element the nucleus is. 18. An beta particle is a helium-4 nucleus. 19. A positron is a positive electron and is the antiparticle of an ordinary electron. 20. Fusion reactors are a dream for the future because they can produce energy using ocean water as fuel and because they will cause no pollution. |