Scanned with CamScanner Question 8
(a) Define acceleration.
(2)
(b) A body has an initial velocity u and an acceleration a. Aller a time i the body has moved
a distance s and has a final velocity v. The motion is summarised by the equations
V = U+ al,
klu + v)
(1) State the assumption made about the acceleration a in these equations.
SS
(11) Use the equations to derive an expression for v in terms of a and s.
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(c) A photographer wishes to check the time for which the shutter on a camera stays open
natoomph in boing token To do this a metal hall is photographed as it falls

Air enters a gas turbine with two stages of compression and two stages of expansion at 100 kpa and 17°c. this system uses a regenerator as well as reheating and intercooling – the intercooler returns the air to the inlet temperature. the pressure ratio across each compressor is 4 ; 300 kj/kg of heat are added to the air in each combustion chamber; and the regenerator operates perfectly while increasing the temperature of the cold air by 20°c. determine the system’s thermal efficiency. assume isentropic operations for all compressor and the turbine stages and use constant specific heats at room temperature. (0.378)