A proton is projected in positive X direction into a region of uniform electric field E= _6×10^ 5 N/C at t= 0 .The proton travel 7cm as it comes to rest . Determine the acceleration of proton (b) it's initial speed (c) time interval over which proton comes to rest.

Refrigerant-134a enters the compressor of a refrigerator as superheated vapor at 0.14 mpa and -10°c at a rate of 0.05 ka/s and leaves at 0.8 mpa and 50°c. the refrigerant is cooied in the condenser to 0.72 mpa and 26'c. it is then throttled to 0.15 mpa. sketch the t-s diagram for the system and evaluate: 6) the rate of heat removai from the refrigerated space (kw), it) the power input to the compressor (kw), ii) the isentropic efficiency of the compressor (%), and iv) the cop of the refrigerator.