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When a strobe light is turned on it flashes 20.0 times in 3.00 seconds. What is the frequency of the light?
A space ship sends a radio transmission back to earth, which is 2.75 x 109 m away. How long will this transmission take?
What is the thermal energy removed to convert 0.5 kg of water at 0 degrees celsius to ice at 0 degrees celsius An ideal air-standard Brayton cycle operates at steady state with compressor inlet conditions of 300K
and 100kPa and a fixed turbine inlet temperature of 1700K. For the cycle, determine (a) the pressure
ratio for given thermal efficiency of 45% and (b) the net power developed
An ideal diesel engine has a compression ratio of 20 and uses air as the working fluid. The state of air at
the beginning of the compression process is 95kPa and 20
0C. If the maximum temperature in the cycle is
not exceeding 2200K, determine (a) the thermal efficiency and (b) the mean effective pressure.
A gas engine working on the Otto Cycle has cylinder bore of 200mm and stroke length of 250mm. The
clearance volume is 1570cm
3
. The pressure and temperature at the beginning of compression are 1 bar
and 27
0C respectively. The maximum temperature of the cycle is 1400
0C. Determine the pressure and
temperature at the salient points, the air standard efficiency, the work done and the mean effective
pressure. Also calculate the ideal power developed by the engine, if the number of working cycles per
minute is 500.
In an air standard dual cycle, two-thirds of the total heat supply occurs at constant volume. The state at
the beginning of the compression process is 90kPa and 20
OC and the compression ratio is 9. If the total
heat supply is 2100kJ/kg, determine the maximum pressure and temperature and thermal efficiency of
the cycle.
In an air standard Otto cycle with compression ratio of 10, air is compressed from 100kpa and 27
0C,
after which 1500kJ/kg of heat is added to it at constant volume. Compute (i) thermal efficiency of the
cycle, (ii) air temperature at the end of compression, heat addition and expansion processes and (iii) the
mean effective pressure of the cycle.
A baseball has 20 times the mass of a ping pong ball although the ping pong ball is moving. twice as fast as the baseball. Compared to the kinetic energy of the ping pong ball, the baseball has.
A rigid tank of 2 m3
volume contains pressurized air at 400 kPa and 25∘
C. The tank slowly deflates through a small hole in the tank wall. Due to
the loss of air, the pressure drops to 100kPa and due to heat transfer with
the environment, the temperature of the air in the tank remains on 25∘C.
Calculate the net heat transfer.
