The current through an electrical device is given as i(t) = 30e -0.2t mA, and the voltage through the device is given as v(t) = 100( 1 - e -0.2t ) V. For this device, determine:

a. The charge delivered from t = 0 to t = 3s.
b. The instantaneous power at t = 2s.
c. The total energy delivered for all time (i. e. from t = 0 to t = [infinity]).

Heat is added to a piston-cylinder device filled with 2 kg of air to raise its temperature 400 c from an initial temperature of t1 27 cand pressure of pi 1 mpa. the process is isobaric process. find a)-the final pressure p2 b)-the heat transfer to the air.

Ariver flows from north to south at 8 km/h. a boat is to cross this river from west to east at a speed of 20 km/h (speed of the boat with respect to the earth/ground). at what angle (in degrees) must the boat be pointed upstream such that it will proceed directly across the river (hint: find the speed of the boat with respect to water/river)? a 288 b. 21.8 c. 326 d. 30.2

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.