Let the message signal to a DSB-SC modulator be a multi-tone sinusoidal signal given by m(t) = A1 cos(2f1t) + A2 cos(2f2t) + A3 cos(2f3t) The carrier signal is given by c(t) = Ac cos(2fct). Develop a Matlab script to answer the followings: (a) Plot the DSB-SC modulated wave and its amplitude spectrum. (b) Find the required transmission bandwidth for DSB-SC wave. (c) Find the total average transmit power of the DSB-SC wave.

What precautions should you take to prevent injuries when dealing with heavy loads?

Slip occurs via two partial dislocations because of (a) the shorter path of the partial dislocation lines; (b) the lower energy state through partial dislocations; (c) the charge balance.

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.