Molecular Physics | Thermodynamics Answers

A 110mm diameter cylinder contains 100cm3 of water at 60°C. A 50kg piston sits on top of the water. If heat is added until the temperature is 200°C, find the work done.

Calculate the change in entropy when 12g of water at -10oC is raised to 100oC and convert to steam at 100oC. Assume that specific heat of water cwater = 4190 J·g-1·K-1, heat of vaporization Lv = 2256 kJ/kg, specific heat of ice cice = 2220 J·g-1·K-1, heat of fusion LF = 334 kJ/kg.

a bubble of 5.0 mol of helium is submerged at a certain depth in liquid water when the water undergoes a temperature increase VT of 20 centigrade at constant pressure .As a result the bubble expands.How much heat Q is added to the helium during the expansion and temperature increase?

One kg of a steam with quality of 20 percent is heated at a constant pressure of 200kPa until the temperature reaches 400°C. Calculate the work done by the system.

A 150-kg roller coaster car moving with a velocity of 4 m/s to the right hits a 125-kg car that is standing still. If the two cars hit and stick together, what is their final velocity?

A rider drifting on a lazy river moves with a displacement of 85 m. If their initial position was at -31m, what was their final position?

A 100kg box is laying still in a wooden box. What is the horizontal force needed to start the crate moving

A train ride at a amusement park travels at an average speed of 10.5 miles per hour for 0.08 hours. What distance does the train travel during that time?

Making a glass of Brown Sugar Bubble Milk uses 1/4 L of 85.0°C water before cooling it down to room temperature at 27.0°C.
a) Calculate the entropy change of the milk while it cools, the specific heat of water is 4190 J·g-1·K-1
b) Calculate the change in entropy of the air while the milk cools, if all the heat lost by the water goes into the air, and the cooling process is virtually isothermal for the air.
c) What is the total entropy change of the system (milk + air)? Explain the meaning of the result

You mix two sample of water. Sample A is 200g at 20oC. Sample B is 100g at 95oC. Calculate total change in entropy of the process. Assume that specific heat of water is 4190 J·g-1·K-1