Agasoline truck engine takes in 10,000 j of heat and delivers 2000 j of mechanical work per cycle. the heat is obtained by burning gasoline with heat of combustion

(a) what is the thermal efficiency of this engine?
(b) how much heat is discarded in each cycle?
(c) if the engine goes through 25 cycles per second, what is its power output in watts? in horsepower?
(d) how much gasoline is burned in each cycle?
(e) how much gasoline is burned per second? per hour?

On a average work day more than work place firs are reorted

Aloaded platform of total mass 500 kg is supported by a dashpot and by a set of springs of effective stiffness 72 kn/m. it is observed that when the platform is depressed through a distance x = 12.5 cm below its equilibrium position and then released without any initial velocity; it reaches its equilibrium position in the shortest possible time without overshoot. find the position and velocity of the loaded platform 0.10 sec. after its release. if a further load of 400 kg is added to the platform, find, i) the frequency of damped vibrations, and i) the amplitude of vibration after 2 complete oscillations, given that the initial amplitude is 15 cm.

An air compression refrigeration system is to have an air pressure of 100 psia in the brine tank and an allowable air temperature increase of 60°f for standard vapor compression cycle temperatures of 77 f entering the expansion cylinder and 14 f entering the compression cylinder, calculate the coefficient of performance a. 2.5 b 3.3 c. 4.0 d. 5.0