One kg of air is contained in a closed tank at 300k, with rigid walls. heat is now added to increase the air temperature by 1°c. find the amount of heat added to the system, and the change in internal energy and enthalpy of the system. ii) one kg of air is contained in a closed tank at 300k, with a massless piston at one end. the pressure outside is 1 atm. heat is now added to increase the air temperature by 1°c. find the amount of heat added to the system, and the change in internal energy and enthalpy of the system. iii) solve above (i) and (ii) if the temperature increase is 2°c, rather than 1°c. given: assume constant cp=1.005 kj/kg k, and cv=0.718 kj/kg k.

Suppose that two tanks, 1 and 2, each with a large opening at the top, contain different liquids. a small hole is made in the side of each tank at the same depth 1.57 m below the liquid surface, but the hole in tank 2 has 2.49 times the cross-sectional area of the hole in tank 1. (a) what is the ratio ρ1/ρ2 of the densities of the liquids if the mass flow rate is the same for the two holes? (b) what is the ratio rv1/rv2 of the volume flow rates from the two tanks? (c) at one instant, the liquid in tank 1 is 14.9 cm above the hole. if the tanks are to have equal volume flow rates, what height above the hole must the liquid in tank 2 be just then?

The chart shows the costs and shipping times for materials that a company needs to build a new product. which describes the best trade-off if the company needs to start building their product within the next two years? they should order the domestic materials because it is always best to choose the fastest shipping time. they should order the imported materials because it is always best to choose the lowest cost for materials. since the shipping time is longer, they should order the domestic materials because the additional cost is worth it to get the materials in time. even though the shipping time is longer, they should order the imported materials because they are less expensive and should arrive in plenty of time to build the product.

Use 4 to 5 complete sentences, explain the concepts of beats and how beats are produces.