If you had a mass of 44 g and a volume of 40.5ml what is the density

How many neutrons does element x have if it’s stormy umber is 33 and it’s mass number is 95?

Which atomic model was proposed as a result of j. j. thomson’s work?

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.