have diferent temperabcure (a) The glasses will less ice (b) The glasses will ha
ID: 777800 • Letter: H
Question
have diferent temperabcure (a) The glasses will less ice (b) The glasses will have different temperstures because a lesser fraction of glass A is ice. (c) From the information given, it ls not possible to determine the relative temperatures of the glasscs. (d) The glasses will have the same temperature. 3. When a metal bar is cooled from 50°C to 35°C, its length decreases from 4.001 m to 4 m. What is the coefficient of linear expsnsion for this metal? (a) 6.67 x 10-C (b) 7.14 x 10-0C (c) 6.67 × 10-2-C d) 1.67 x 10-°C 4. Which of the following in NOT an example of heating by convection? (a) A microwave oven heats a potato with electromagnetic radiation. (b) A fan blows hot air around the inside of an oven to better heat a potato. (c) Hot air from a campfire rises to cook a marshmallow. (d) A gas heater uses a fan to push hot air around the room, heating the room. 5. Two identical potatoes, one at 100°C and the other at 90°C, are placed on a table. The tem- perature of the room is 15°C, and the potatoes begin to cool. Which of the following statements is NOT true? (a) As the potatoes cool, the 90°C potato will always be cooler than the 100°C potato. (b) At every point in time, the total amount of heat lost by both potatoes will be the same. (c) As the potatoes cool, the 100 C potato will always lose heat faster than the 90°C potato. (d) At no point in time will either potato reach a temperature below 15°C. 6. Which of the following is a true statement about Earth's greenhouse effect? (a) Greenhouse gases are transparent to light radiated by the sun, but absorb infrared rays radiated by the Earth. (b) Greenhouse gases abeorb sunlight faster than the Earth can radiate it away. (e) Greenhouse gases are transparent to light radiated by the sun, bat abeorb sunlight that ias reflected by the Earth. (d) Greenhouse gnses create holes in the ozone layer, meaning more sunlight can pass through and heat the Earth. 7. If you pull up on an insulated bike pump with a force of 500 N and the handle moves a distance of 0.4 meters, how will the internal energy of the air inside the pump change? (a) It will decrease by 1250 J. (b) It will remain the same.Explanation / Answer
4) a) a microwave oven heats a potato with elctromagnetic radiation
5) b)at every point in time , the total amount of heat lost by the both potatos will be same
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