1. You heated a container with 4 liters of water for a certain time and its temperature rises by 2 °C. if you heated at the same amount for the same time to 2 liters of water, by how much its temperature rise? Explain why.
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- 23:40 LTE1 ulll alll Your answer Qoc. What is your name? * e.g. Raymond Ng Your answer Q1. When steel plate and wooden plate of the same mass are placed under the sunlight, which plate will rise its temperature more quickly? * O Steel plate O Wooden plate Q2. Which plate, steel plate or wooden plate, has a larger heat capacity? * O Wooden plate O Steel plate Q3. The heat capacity of a substance is defined as: * the volume of substance to store 1 °C of heat. the amount of energy for a substance required to increase the temperature by 1 °C. the amount of energy required for substance of 1 kg to increase the temperature by 1 °C. Q4. A substance takes in energy of Q to increase its temperature by AT. Which formula can calculate the heat capacity (C) of the substance? * O C = QAT O C = Q/AT O C = AT/Q Q5. The more massive a substance, the the heat capacity. * smaller larger O same Q6. The specific heat capacity of a substance is defined as: * O the amount of energy for a substance required…11. Phoebe’s insulated foam cup is filled with 0.15 kg of coffee (mostly water) that is too hot to drink, so she adds 0.010 kg of milk at 5.0 degrees Celsius. If the coffee has an initial temperature of 70.0 degrees Celsius and the specific heat of milk is 3800 J/kgC, how hot is the coffee after the milk is added? (Assume that no heat leaks out through the cup.) a. 62 degrees Celsius b. 66 degrees Celsius c. 53 degrees Celsius d. 59 degrees Celsius e. None of the above1. 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?
- #1. Consider a lake in Vermont at the end of summer. At the end of summer, you can assume the average surface water temperature is about 20 °C and the bottom of the lake is about 10 °C. Explain in detail what happens as the cold air of winter arrives. Be sure to discuss in detail how various heat transfer mechanisms are working.9. In an experiment, a 0.290-kg piece of ceramic superconducting material at 19 °C is placed in liquid nitrogen at its boiling point (-195.8 °C) to cool. The nitrogen is in a perfectly insulated flask that allows the gaseous N2 to escape immediately. How much mass of liquid nitrogen will be boiled away? (Take the specific heat of the ceramic material to be the same as that of glass.) grams sst60 s 60 ssfeThe 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.