A Carnot refrigerator is operated between two reservoirs and the cold
reservoirs is at temperature of 270K. If in each cycle the
refrigerator receives 415 J of heat energy from the reservoir at 270K
and 77 J work is needed to be done on the working substance. The
quantity of the heat energy delivered to the hot reservoir is ().
A: 90J
B: 338 J
C: 492J
D: 578J
reservoirs is at temperature of 270K. If in each cycle the
refrigerator receives 415 J of heat energy from the reservoir at 270K
and 77 J work is needed to be done on the working substance. The
quantity of the heat energy delivered to the hot reservoir is ().
A: 90J
B: 338 J
C: 492J
D: 578J
举一反三
- A diesel engine performs<br/>35000 J of mechanical work and discards 45000 J of heat each cycle.<br/>The heat supplied to the engine in each cycle is () A: 10000J B: 45000J C: 25000J D: 80000J
- One mole of hydrogen with an initial temperature of 27℃ expands<br/>and in the process, absorbs 4000 J of heat and does 3000 J of work,<br/>the<br/>final temperature of the gas is () A: 62.3℃ B: 105.6℃ C: 75.1℃ D: 56.3℃
- A<br/>gas enclosed in a cylinder by means of a piston that can move without<br/>friction is warmed, and 1000 J of heat enters the gas. Assuming that<br/>the volume of the gas is constant, the change in the internal energy<br/>of the gas is [] A: 0 B: 1000<br/>J C: -1000<br/>J D: None<br/>of the above
- DU = 100 J is for a system that gives off 100 J of heat and ( ) A: does no work B: does 200 J of work C: has 100 J of work done on it D: has 200 J of work done on it.
- 欲使JK触发器按Qn+1=0工作,可使JK触发器的输入端 。[br][/br] [br][/br](多选题) A: J=K=1 B: J=Q,K=Q C: J=Q,K=1 D: J=0,K=1