Acombined gas-steam power cycle uses a simple gas turbine for the topping cycle and a simple rankine cycle for the bottoming cycle. atmospheric air enters the compressor at 101 kpa and 20 degc, and the maximum gas cycle temperature is 1100 degc. the compressor pressure ratio is 8; the compressor isentropic efficiency is 85 percent; and the gas turbine isentropic efficiency is 90 percent. the gas stream leaves the heat exchanger at the saturation temperature of the steam flowing through the heat exchanger. steam flows through the heat exchanger with a pressure of 6000 kpa and leaves at 320 degc. the steam cycle condenser operates at 20 kpa, and the isentropic efficiency of the steam turbine is 90 percent. determine the mass flow rate of the air through the air compressor required for this system to produce 100 mw of power. use constant specific heats for air at room temperature. ( 279 kg/s).

answer: the correct answer is 1.

explanation: there are various process in which a radioactive nuclei decays:

1) alpha decay: in this process, a heavier nuclei decays into lighter nuclei by releasing alpha particle. the mass number is reduced by 4 units.

2) electron capture: in this decay process, a parent nuclei absorbs an electron and gets converted into a neutron. simply, a proton and an electron combines together to form a neutron. mass number does not change in this process.

3) gamma ray emission: it is a decay process in which an unstable nuclei gives excess energy by a spontaneous electromagnetic process. this decay releases . this process does not change the mass number.

4) positron emission: it is a type of decay process, in which a proton gets converted to neutron and an electron neutrino. this is also known as -decay. in this the mass number remains same.

from the above information, we see that only alpha-decay is producing a change in the mass number of the nucleus.

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find the surface area of the sphere to the nearest square unit. use a calculator.

a. 254 in.2

b. 64 in.2

c. 127 in.2

d. 1,018 in.2

at right angles to each other