What is transmitted by all waves? energy mass matter sound

Which simple machine is not part of this compound machine? a. lever b. pulley c. inclined plane d. wheel and axle

A2k pendulum has a speed of 1 m/s at a height of 1/2 meter

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.