The electric potential in a certain region is V = α x2 y 2 + β z2 (x 2 − γ) + δ y3 z , where α = 3 V/m4 , β = 5.4 V/m4 , γ = 5 m2 , and δ = 4.5 V/m4 . What is the y component of the electric field Ey at (1.1 m, −1 m, 4.1 m)? Answer in units of V/m.

Amass of 1.5 kg of air at 120 kpa and 24°c is contained in a gas-tight, frictionless piston-cylinder device. the air is now compressed to a final pressure of 720 kpa. during the process, heat is transferred from the air such that the temperature inside the cylinder remains constant. calculate the boundary work input during this process.

Abrake has a normal braking torque of 2.8 kip in and heat-dissipating cast-iron surfaces whose mass is 40 lbm. suppose a load is brought to rest in 8.0 s from an initial angular speed of 1600 rev/min using the normal braking torque; estimate the temperature rise of the heat dissipating surfaces.

The drive force for diffusion is 7 fick's first law can be used to solve the non-steady state diffusion. a)-true b)-false