Amysterious device found in a forgotten laboratory accumulates charge at a rate specified by the expression gm = 9 - 10tc from the moment it is switched on. (a) calculate the total charge contained in the device at t: o. (b) calculate the totalcharge contained at t: 1 s. (c) determine the current flowing into the device at t: 1 s, 3 s, and 10 s.

Determine whether or not it is possible to compress air adiabatically from k to 140 kpa and 400 k. what is the entropy change during this process?

How much power could a wind turbine produce if it had the following specifications? cp = 0.45 -d=1.2kg/m3 d=50m v 5m/s

Amixture of slurry and mud is to be pumped through a horizontal pipe of diameter 500 mm. the fluid behaves as a bingham plastic with a yield stress of 30 pa and viscosity 0.04 pa.s. describe the effects of the shear stress through a transverse section of the pipe by plotting the variation in shear stress and velocity profile: (i) just before the slurry starts to move (ii) as the slurry flows when the pressure gradient is double that in part (i)