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If an elevator starting from rest accelerates at 10 m/s^2 and then decelerates at -1 m/s^2 until it reaches the top floor at 100m, calculate the shortest time it takes for it to reach the top floor (ignore gravitational acceleration, assume g=0). plot the corresponding a-t, v-t and s-t graphs
a closed system contains 0.6 kg of helium at 156 kpa with a volume 0.4m3. this systme undergoes a polytropic process
an ideal vapor compression refrigeration cycle that uses r-134a maintains a pressure in the condenser of 1000kpa and
A battery of silicon photocells mounted on a plane surface operates with an efficiency of 16.7% under all conditions encountered in this problem. it is installed at a location 45 degrees north. the time is 10:00 on April 1, 1995. When the battery fac..
a small high speed turbine operating on compressed air produces a power output of 100 w. the inlet state is 4 bar 50
nitrogen gas enters a diffuser at 100 kpa and 110 degrees c with a velocity of 205 ms and leaves at a 110 kpa and 45
let us consider a solar powered water heater. the solar collector surface is coated with black chrome whose emissivity
(i) Name any incongruent melting intermediate compound(s) present. (j) Locate and draw a square around all congruent melting equilibria. (k) Label all the two-phase fields. (l) Is either Ti or Ni allotropic?
consider a mass going through a polytropic process where pressure is directly proportional to volume n-1 the process
The power output of an ideal, open-cycle gas turbine cycle is 75 MW and its pressure ratio is 16. Air enters the compressor at 520 R and enters the turbine at 2800 R. Using variable specific heats at 1000°F: cp = 0.263 Btu/lbm-R and k = cp/cv = 1.353..
a construction crew lifts approximantely 560lb of material serveral times during the day from a flatbed truck to a 32
the gap at c is initially 0.15mm before load p is applied. for p200kn the gap will close. determine the stress in ab
a piston cylinder device having an initial volume of 2 m3 initially contains steam at 10 bars and 200oc state 1. the
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