Molecular Physics | Thermodynamics Answers

The maximum possible decrease in energy during the grain-growth of Copper, where the grain boundary energy is 0.5Jm^-2 and the initial grain diameter is 0.3mm is?

For the same diffusion time, the depth of penetration at 500 degree celcius and 850 degree celcius is in the ratio 1:6. The activation process for the above diffusion process is?

A certain perfect gas is heated at constant pressure from 15 degrees celcius to 95 degrees celcius, the energy required is 1136 KJ / kg.
When this same gas is heated at constant volume to the same temperatures, the energy required is 808
KJ / kg. Calculate:
(i) Mass heat at constant pressure, cp
(ii) Mass heat at constant volume, CV
(iii) The value of γ
(iv) The particular gas constant, Rp
(v) Molar mass, Mr

A certain perfect gas is heated at constant pressure from 15 degrees celcius to 95 degrees celcius, the energy required is 1136 KJ / kg.
When this same gas is heated at constant volume to the same temperatures, the energy required is 808
KJ / kg.
Calculate:
(i) Mass heat at constant pressure, cp
(ii) Mass heat at constant volume, CV
(iii) The value of γ
(iv) The particular gas constant, Rp
(v) Molar mass, Mr

Oxygen , at a pressure of 200 bars, will be contained in a steel container at a temperature of 20 degrees celcius.
The volume of the container is 0.04 m3. Assuming that Oxygen is an ideal gas, calculate the mass of Oxygen which can
be contained in the container.
The container is protected against excessive pressure by a fusible plug which will melt if the temperature
goes too high.
Calculate at what temperature the fuse plug will melt if the pressure is limited to 240 bar.
(The molar mass of oxygen = 32 Kg / Kmol and Ru = 8314 J / Kmol K)

A person runs 800m at an average speed of 6.0m/s and then the next 800 M at an average speed of 8.0 m/s. What is the total time required?

At what temperature on the Fahrenheit scale will temperature on a centigrade scale be three times that on a Fahrenheit scale?

Prices to a concert cost N$ 200 for an adult and N$ 150 for a child, the convert venue can accommodate at most 240 people. The organizers are giving a N$ 20 discount to every adult and N$ 10 discount for every child but do not want the total discounted to exceed N$ 3200. Draw a graph and use it to answer the following questions. 1. How many tickets all together should the organizers sell in order to maximize their sales amount? 2. How many tickets of each type ( adult and child) should they sell to get a maximum sales amount? 3. What is the maximum sales amount the organizers can make? 4.If the profit is calculated as follows: profit = total sales - total discount amount. How much profit will the organizers from the maximum sales?

A couple is planning a wedding and they need to decide how many quests on the bride’s side as well as the groom’s side to invite.The has agreed that the bride can invite at most 60 quests. Since the bride’s friends and family are very fancy it costs N$ 300 per quest on her side while it only costs N$ 150 per quest on the groom’s side and they have a budget of N$ 30000. Each quest on the bride’s side will receive 4 drink tickets and each quest on the groom’s side will receive 3 drink tickets and no more than 500 drink tickets can be given. Keeping in mind that both the bride and groom must have quests ( neither of them can attend the wedding without any of their friends or family present ) Draw a graph and use it to answer the following questions: (i) what is the maximum number of quests that can attend the wedding? (II) How many quests will the bride and the groom each invite?

A truck travels at a speed of 80.0 km/h and has a mass of 2 000 kg. What is its kinetic energy?