Which statement best summarizes the central idea of “applications of newton’s laws”?
a. newton’s laws can explain the forces that occur between objects every day.
b. newton’s laws are useful for explaining why we should make good decisions.
c. people should use caution when moving objects, due to objects’ inertia.
d. newton’s laws are outdated and cannot be used for present-day problems and situations.

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.