Sakena yacoobi was born in afghanistan and educated in the united states. she started working with the international rescue committee (irc) in pakistan during the mid-1990s. "when you see the joy and excitement in the students' faces, when you see them sitting on dirt floors, under trees, and in dark basements-anywhere to get an education, you forget all your troubles," yacoobi has said of her work.

Which of the following represents an upside-down image?

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.

Consider a hydrogen atom in the ground state. what is the energy of its electron? =e= jj now consider an excited‑state hydrogen atom. what is the energy of the electron in the =5n=5 level? =e5= j