Two 50-g ice cubes are placed into 0.2kg of water in a Styrofoam cup. The water is initially at a temperature of 25C and the ice is initially at a temperature of -15C. What is the final temperature of the drink? The average specific heat for ice between -15C and 0C is 2.05kJ/kgC
Energy transfer
The flow of energy from one region to another region is referred to as energy transfer. Since energy is quantitative; it must be transferred to a body or a material to work or to heat the system.
Molar Specific Heat
Heat capacity is the amount of heat energy absorbed or released by a chemical substance per the change in temperature of that substance. The change in heat is also called enthalpy. The SI unit of heat capacity is Joules per Kelvin, which is (J K-1)
Thermal Properties of Matter
Thermal energy is described as one of the form of heat energy which flows from one body of higher temperature to the other with the lower temperature when these two bodies are placed in contact to each other. Heat is described as the form of energy which is transferred between the two systems or in between the systems and their surrounding by the virtue of difference in temperature. Calorimetry is that branch of science which helps in measuring the changes which are taking place in the heat energy of a given body.
Two 50-g ice cubes are placed into 0.2kg of water in a Styrofoam cup. The water is initially at a temperature of 25C and the ice is initially at a temperature of -15C. What is the final temperature of the drink? The average specific heat for ice between -15C and 0C is 2.05kJ/kgC.
a. 12.35 deg C
b. 10.6 deg C
c. 20.2 deg C
d. 15.5 deg C
A tire with an inner volume of 0.025 m^3 is filled with air at a gauge pressure of 36psi. If the tire valve is opened to the atmosphere, what volume outside of the tire does the escaping air occupy? Some air remains within the tire occupying the original volume, but now that remaining air is at atmospheric pressure. Assume the temperature of the air does not change.
a. 0.086 m^3
b. 0.096 m^3
c. 0.868 m^3
d. 0.673 m^3
The water passing over Victoria falls, located along the Zambezi River on the border of Zimbabwe and Zambia, drops about 105 m. How much internal energy is produced per kilogram as a result of the fall?
a. 1030.05
b. 1260.05
c. 1180.05
d. 1770.05
An ideal gas that occupies 1.2m^3 at a pressure of 1 x 105 Pa and a temperature of 27C is compressed to a volume of 0.6m^3 and heated to a temperature of 227C. What is the new pressure?
a. 333.33 kPa
b. 444.44 kPa
c. 555.55 kPa
d. 666.66 kPa
A heating coil inside an electric kettle delivers 2.1kW of electric power to the water in thekettle. How long will it take to raise the temperature of 0.5kg of water from 20C to 100C?
a. 80 seconds
b. 60 seconds
c. 50 seconds
d. 40 seconds
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