What is the rate of heat transfer when q= 90, t1 = 20, t2= 40

A house, for cooling purposes, consists of two zones: the atric area zone A and the living area zone B (see below figure). The living area is cooled by a 2 -ton air conditioning unit that removes 23,000 Btu/hr. The heat capacity of zone B is 1/6 °F per thousand Btu. The time constant for heat transfer between zone A and the outside is 3ℎr, between zone B and the outside is 6ℎr, and between the two zones is 6ℎr. If the outside temperature stays at 90°F, how warm does it eventually get in the attic zone A ?

A firearm can be modeled as a kind of heat engine, where the projectile acts as a piston that separates from the rest of the system during expansion. Consider a rifle with a 1.70 kg barrel made of iron [specific heat = 448 J/(kg °C)]. The rifle fires a 4.00 g bullet that exits the barrel with a speed of 350 m/s. When the propellant is ignited, 1.10% of the energy released goes into propelling the bullet (this is the thermal efficiency of the "engine"). The other 98.9% can be approximated as being entirely absorbed by the barrel, which increases in temperature uniformly for a short time before this energy is dissipated into the surroundings. What is this temperature increase (in °C)? (Round your answer to at least one decimal place.) °℃

Select correct statements about the comparison between the science of heat transfer and the science of thermodynamics O We can use either one to calculate the time of cooling or heating processes One is about the non-equilibrium situation, and another one deals with equilibrium. O One is about the rate of heat transferred, and another one is about the amount of heat transferred O Time does not play any role in thermodynamics, but it does in heat transfer

A heat engine has a thermal efficiency of 40 percent and it produces 600 kJ of work. What is the heat input to the heat engine, in MJ? Report your answer to one decimal place.