TAILIEUCHUNG - SAT II Physics (SN) Episode 2 Part 1

Tham khảo tài liệu 'sat ii physics (sn) episode 2 part 1', ngoại ngữ, ngữ pháp tiếng anh phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Asphalt like most materials has a positive coefficient of linear expansion meaning that it expands as temperatures rise in summer and shrinks as temperatures fall in winter. This effect is called the law of thermal expansion D. The gaps in the sidewalk allow the blocks to expand without pushing against each other and cracking. 4. E Convection is a form of heat transfer where a large number of molecules move from one place to another. An overhead fan works precisely by this method it sends cooler air molecules down into a hot room cooling the temperature of the room. The heat of the sun and the cooking action of a microwave are both forms of radiation while the heat on a frying pan and the cooling action of ice cubes are both forms of conduction. 5. A Since the gas is in a closed container its volume remains constant so the correct answer is A. When the gas is heated its temperature increases meaning that the average speed of the gas molecules increases. An increase in temperature also means there are more collisions between molecules. According to the ideal gas law when volume is constant and temperature is increased then pressure will also increase. Pressure is determined by the rate of collisions of the gas molecules with the walls of the container. 6. A According to the ideal gas law temperature is directly proportional to volume and pressure. Since the volume of the container is constant that means that doubling the temperature will double the pressure. R is a constant it doesn t vary under different circumstances so C is wrong. Also we are looking at a random sample of the gas so there won t be a heavier isotope in one or the other of the containers E is also wrong. 7. D The ideal gas law states that temperature is directly proportional to pressure and volume. Since the gas is in a closed container the volume is fixed so an increase in temperature leads to an increase in pressure. The correct answer is D. The atomic mass and the number of molecules are fixed .

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