An air-standard dual cycle has a compression ratio of 9. at the beginning of compression, p, 100 kpa, t, 300 k, and v 14 l. the heat addition is 22.7 kj, with one half added at constant volume and one half added at constant pressure. determine (a) the temperatures at the end of each heat addition process, in k. (b) the net work of the cycle per unit mass of air, in kj/kg. (c) the thermal efficiency. (d) the mean effective pressure, in kpa

The pressure, volume, and temperature of a mole of an ideal gas are related by the equation pv = 8.31t, where p is measured in kilopascals, v in liters, and t in kelvins. use differentials to find the approximate change in the pressure if the volume increases from 14 l to 14.6 l and the temperature decreases from 375 k to 370 k. (round the answer to two decimal places.)

You are a sales representative for a company that makes a new alternate fuel for vehicles. you have prepared a presentation for the environmental engineers to sell your new product. what question do you expect the audience to ask regarding whether the new fuel will cause less damage to the environment? a. do we have to change any parts of the vehicle to use this alternate fuel? b. will the vehicles get better fuel mileage with the alternate fuel? c. how much greenhouse gas does your fuel produce compared with current fuel sources? d. is the alternate fuel more expensive than fossil fuel?

What is friction? how does it affect the motion of an object?