Consider the motion of a positive point charge in a region where there are simultaneous uniform electric and magnetic fields 0 ˆ E E j = ur and 0 ˆ B B j. = r At time t = 0, this charge has velocity v r in the x-y plane, making an angle ? with the x-axis. Which of the following option(s) is (are) correct for time t > 0?(A) If 0 , ? = ° the charge moves in a circular path in the x-z plane.(B) If 0 , ? = ° the charge undergoes helical motion with constant pitch along the y-axis.(C) If 10 , ? = ° the charge undergoes helical motion with its pitch increasing with time, along the y-axis.(D) If 90 , ? = ° the charge undergoes linear but accelerated motion along the y-axis.

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consider the figure of a single riveted lap joint as follows

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cyclic heat engine operates between. temperature of 30 C. What is the least rate of heat rejection per kW net output of an engine. source temperature of 800 C and sink

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