A cannon fires a shell at a fixed angle above the horizontal. Which one of the following quantities is the same throughout the shell's flight? (Ignore the effects of air friction.) A. Its speed.
B. Its acceleration
D. The vertical component of its velocity.
C. its velocity

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.