1. Suppose that the temperature drops by 3°C overnight. How much of a change is that in Kelvin? Now, let's say that the high temperature during the day was 17°C. What was the low temperature? What are the high and low temperatures in Kelvin?
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- At what point do the Celsius and Kelvin temperature scales have the same value? A.never B.when water freezes C.at absolute zero D.when water boils10. How much thermal energy do you need to melt 1.0 gram of ice (an ice cube)? The latent heat of water is 334,000 J per kilogram. * A. 334 joules B. 334 kilojoules C. 3,340 kilojoules D. 33,400 kilojoules E. 334,000 kilojoulesQ19 Does our ability to survive on Earth’s surface depend on the greenhouse effect? Explain.
- 4. When 500J of heat flows into an object, its temperature rises by 4C°. What is the heat capacity of that object? Q 500 = ΔΤ We have AT = = 125J/K. (We can use Cº in 4 formulas that have AT; we don't need to convert to Kelvin.) so so C =1. Would air at the same temperature feel the same? Why or why not? 2. Would your perceptions have changed if the cold water was 0° C and the warm water was 80°C? 3. . Why would it be important to be able to perceive the difference between 45°C and 80°C?5. You set an oven to 350 degrees F (180 C). You put uncooked cookies into the oven oma metal ban. Why do the cookies heat up? Does the oven temperature change as the cookies heat up? What happens if you unplug the oven (after it is already set at 350 degrees)?
- The same heat transfer into identical masses of different substances produces different temperature changes. Calculate the final temperatures when 1 kcal of heat transfers into 1.5 kg of the following, originally at 21°C. Hint a. Into water: the final temperature of water is °C. b. Into concrete: the final temperature of concrete is °C. c. Into steel: the final temperature of steel is C. d. Into mercury: the final temperature of mercury is °C.9. A fitness club hires you to talk to their clients about the biomechanics of exercise. One of the clients likes to walk stairs at her office during her lunch hour for exercise. She wants to know if she can burn off the calories from one candy bar (180 kilocalories) by climbing up 1,500 steps of stairs. One kilocalorie equals 4,184 Joules. She weighs 65 kg and the height of one stair is 20 cm. The gross efficiency of her positive work is 25%.2. A bowl of water has a temperature of 50°C. It is put into a refrigerator where the temperature is 5°C. After 0.5 hours, the water is stirred and its temperature is measured to be 20°C. It is then left to cool further, take t in Newton's law of cooling to be measured in minutes. Use Newton's law of cooling to predict when the temperature will be 50°C.