A boat is traveling 12m/s East along a river that pushing the boat with a velocity of 8m/s South, what would angle used to describe the resultant velocity (just the angle without any other direction)? a)40°
b)34°
c)25°
d)17°

Consider a 1000 w iron whose base plate is made of 0.5 cm thick aluminum alloy 2024-t6 (ρ = 2770 kg/m3 and cp = 875 j/kg°c). the base plate has a surface area of 0.03 m2. initially, the iron is in thermal equilibrium with the ambient air at 22°c. assuming 90% of the heat generated in the resistance wires is transferred to the plate, determine the minimum time needed for the plate temperature to reach 200°c.