What are the units of the ratio
?
Container contains 1.0 mol of an ideal gas. Container contains 2.0 mol of the ideal gas. has four times the volume of . The pressure in is twice that in .
What is ?
A driver uses the brakes on a car to descend a hill at constant speed.
What is correct about the internal energy of the brake discs?
A gas storage tank of fixed volume V contains N molecules of an ideal gas at temperature T. The pressure at kelvin temperature T is 20 MPa. molecules are removed and the temperature changed to 2T. What is the new pressure of the gas?
The temperature of a fixed mass of an ideal gas changes from 200 °C to 400 °C.
What is
A solid cylinder of height h and density ρ rests on a flat surface.
Show that the pressure p_C exerted by the cylinder on the surface is given by .
A tube of constant circular cross-section, sealed at one end, contains an ideal gas trapped by a cylinder of mercury of length 0.035 m. The whole arrangement is in the Earth's atmosphere. The density of mercury is .
When the mercury is above the gas column the length of the gas column is 0.190 m.
Show that () × 0.190 = nRT/A where
= atmospheric pressure = pressure due to the mercury column T = temperature of the trapped gas n = number of moles of the trapped gas A = cross-sectional area of the tube.
The tube is slowly rotated until the gas column is above the mercury.
The length of the gas column is now 0.208 m. The temperature of the trapped gas does not change during the process.
Determine the atmospheric pressure. Give a suitable unit for your answer.
Outline why the gas particles in the tube hit the mercury surface less often after the tube has been rotated.
Energy is supplied at a constant rate to a fixed mass of a material. The material begins as a solid. The graph shows the variation of the temperature of the material with time.
The specific heat capacities of the solid, liquid and gaseous forms of the material are , and respectively. What can be deduced about the values of , and ?
A piece of metal at a temperature of 100°C is dropped into an equal mass of water at a temperature of 15°C in a container of negligible mass. The specific heat capacity of water is four times that of the metal. What is the final temperature of the mixture?
The fraction of the internal energy that is due to molecular vibration varies in the different states of matter. What gives the order from highest fraction to lowest fraction of internal energy due to molecular vibration?
Two identical vessels contain the same number of moles of gas and gas at room temperature. Which one of the following is true of the gas pressures?