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How do thermal energy, temperature and heat differ
A small sample of coal, when completely converted into energy, releases 3.75 * 10 ^ 14 j . What is the initial mass of coal, assuming the final mass 0
Use the table of specific heat capacities to solve this problem. A bar of aluminum is heated to 90.0C and then placed into 10.0L of water at 20.0 degrees * C the mixture cools to 22.4 degrees * C , what is the mass the aluminum bar?
What is the potential energi of an object where the mass is 4kg and the height is 8.5 meters
is the Earth a closed or open system(thermodynamics)
How much joules of heat will it take to increase the temperature of 6kg water 5 k ?
A large nitrogen gas bubble is assumed to expand reversibly and adiabatically as it rises through a liquid at 20°C and eventually breaks on the surface. Initially the volume of the bubble is 2 litres and the pressure of the gas in the bubble is 250 kPa. The final pressure of the gas in the bubble just before it reaches the surface is 100 kPa. Using the additional information below, calculate the following:
i) The number of moles of gas in the bubble.
[4 marks]
ii) The final volume of the bubble (just before it reaches the liquid surface).
[4 marks]
iii) The final temperature of the bubble.
[4 marks]
iv) The work done by the expanding bubble.
4 marks
Gas constant 𝑅 = 8.314 JK-1mol-1
Constant pressure molar heat capacity of nitrogen:𝐶𝑝,𝑚 = 29.125 JK-1mol-1
A hydroelectric power station generates electricity by using 500 kg s-1 of water which falls from the storage reservoir through a height of 7.5m before flowing over the turbine blades. Calculate the maximum theoretical power that can be generated by the turbine.
Gas constant 𝑅 = 8.314 JK-1mol-1
Constant pressure molar heat capacity of nitrogen:𝐶𝑝,𝑚 = 29.125 JK-1mol-1
Calculate energy required to pump atmospheric air in a cube of 10*10*10 so that it weight 10 kg more that the initial without change in volume
What is the formula for power?
#340153 on Dec 2023