A1.6 kg ball at the end of a 1.1 m string swings in a vertical plane. at its lowest point the ball is moving with a speed of 17 m/: s (a) what is its speed (in m/s) at the top of its path? 4.64 xm/s (b) what is the tension (in n) in the string when the ball is at the bottom and at the top of its path? bottom of its path 436.04 top of its path

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.