Physics

Transmission of heat

A rapidly spinning paddle wheel raises the temperature of 600 mL of water from 21°C to 25° C. Part A How much heat is transferred in this process? Express your answer with the appropriate units. MA W ? Value J

An open container holds ice of mass 0.580 kg at a temperature of -18.6 °C. The mass of the container can be ignored. Heat is supplied to the container at the constant rate of 730 J/minute Part A The specific heat of ice to is 2100 J/kg . K and the heat of fusion for ice is 334 x 10 J/kg How much time tmelts passes before the ice starts to melt? View Available Hint(s) VOAS ? tmelts = minutes

Name hergy Transformations Study Guide 20. Heat is the 21. 18. Thermal energy is when particles are vibrating SUPER FAST and bun another substance. It's also known as _heat energy form of energy that is transferred from something to something cold. When something is hot, it has lots of hear energy The at the object will be (p Vine past Conduction is heat transfer between stationary objects or simply th 22. CON doctors movement of heat in a Substance 23. insulators move heat very well like: moves heat poorly like: 24. Convection is heat transfer due to the rise and movement of the atoms ir 25. They tend to move in radiation is heat transfer by light (otherwise known as ) moves in Name the type of energy: Rolling balkinetic Lightning Electrical Light Bulb electric Headphones electrical Screaming Sound Rock on a Ledge potential energy Uranium NUCIear Bow and Arrow Kinetoc Cycling Kinetic liquid or a gas. called: 26. directions! Spring potential Stove thermal Give the TRANSFORMATION of energy: Physical energy Kintic Electrical thermal Please only sign if you and your child have studied this togetherl Thanks! Monday Thursday Tuesday Friday

A cylindrical block of length 0.4 m area of cross- section 0.04m² is placed co axially on a thin metal disc of mass 0.4 kg and of the same cross-section. The upper face of the cylinder is maintained at a constant temperature of 400 K and the initial temperature of the disc is 300 K, If the thermal conductivity of the material of the cylinder is 10 watt/m-K and the specific heat of the material of the disc in 600 J/kg-K, how long will it take for the temperature of the disc to increase to 350 K? Assume, for purposes of calculation, the thermal conductivity of the disc to be very high and the system to be thermally insulated except for the upper face of the cylinder.

24. The temperature of 100 g of liquid, pure water is to be raised from 20 °C to 80 °C. How much energy is required to do this (note: the specific heat capacity of water is 1.0 cal/g °C)? A. 1250 cal B. 800 cal C. 6000 cal D. 8000 cal

A gas at 100 fills volume V. Review Part A If the pressure is hold constant, by what factor does the volume change it the Celsius temperature is doubled? IVO AEC 0 ? Submit Request Answer Part B If the pressure is held constant, by what factor does the volume change if the Kelvin temperature is doubled? IVO AED 0 -

A cup of coffee has a temperature of 80°C when it is poured and allowed to cool in a room with a temperature of 30°C. After 1 minute, the temperature of the coffee is 75°C. Determine the temperature of the coffee at time t. How long must you wait until the coffee is 35°C? T(t)= (Use integers or decimals for any numbers in the expression. Round to four decimal places as needed.)

A means your answer is close but wrong (do not round off at all unless stated). Press the SUBMIT YOUR ANSWER(S) button, to save and send your work to your instructor, when you complete or partially complete this exercise. Specific Heat: (a) How much heat must be removed from a 264 g block of steel to lower its temperature g from 80°C to 12°C? Part Answer Units X (a) 879.648 Hint cal

5g of water at 30°C and 5 g of ice at -20°C are mixed together in a calorimeter. Find the final temperature of the mixture. Assume water equivalent of calorimeter to be negligible, specific heats of ice and water are 0.5 and lcal/g° C , and latent heat of ice is 80 cal/g. .

A change in the free energy of a system at constant temperature and pressure will be: Asys G = Asys H – TAsys S At constant temperature and pressure Asys G < 0(spontaneous) Asys G = 0(equilibrium) Asys G > 0(non - spontaneous) = The free energy for a reaction having AH = 31400cal , AS = 32calK-Imol-1 at 1000° C is?

In a process, 10 gm of ice at -5°C is converted into steam at 100°C.If latent heat of fusion of ice is 80 cal g-1, then the amount of heat required to convert 10 g of ice at 0°C into 10 g of water at same temperature is :

Water Ice Students design an experiment with a curved, insulated rod of an unknown thermally conducting material, as shown in the figure. The rod is 1 m long and 2 cm in diameter. One end of the rod is touching the surface of water kept at 350 K by a hot plate, and the other end is just touching the surface of a well-insulated block of ice. The students are required to create a procedure to determine the thermal conductivity of the rod. They first determine that they can measure the amount of ice that has melted after a given time to calculate the heat transfer over time to the block of ice. Which of the following must the students also measure to calculate the thermal conductivity of the rod?

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