I'm pretty sure its b but i need to know as fast as possible which statement best describes universal law a)it is in effect some of all time b)it is in effect all the time c)it changes over time d)it operates under specific conditions

Which of the following represents an upright image? a. -do b. +m c. -m d. +do

Alfred pushes on a heavy box, but cannot move it. the box has a lot of inertia motion friction gravity

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.