A spring stretches by 0.12 m when some apples weighing 3.2 N are supported from it. What is the Spring Constant?

What is the difference between electrically neutral objects and electrically charged objects

How is sound energy produced a. vibrating objects b. objects being heated c. temperature differences d. stationary objects

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.