Time of flight of projectile launched horizontally An object of mass 5 kg is projected horizontally with a speed of 24.4 ms-1 from the top of the cliff. The height of the cliff
is 21.2 m. Take g, the acceleration due to gravity, to be 9.8 ms-2.
The object is in flight for

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.