The manufacturer of a 6 v dry-cell flashlight battery says that the battery will deliver 15 ma for 60 continuous hours. during that time the voltage will drop from 6 v to 4 v. assume the drop in voltage is linear with time. how much energy does the battery deliver in this 60 h interval? express your answer to three significant figures and include the appropriate units. ?

Can anybody me with this? ? (picture included.)

Which is the correct symbol for an isotope of iodine with 53 protons and 78 neutrons?

Acarpenter builds an exterior house wall with a layer of wood 2.9 cm thick on the outside and a layer of styrofoam insulation 2.3 cm thick on the inside wall surface. the wood has k=0.080w/(m⋅k), and the styrofoam has k= 0.010 w/(m⋅k). the interior surface temperature is 19.0 ∘c , and the exterior surface temperature is -15.0 ∘c . a.)what is the temperature at the plane where the wood meets the styrofoam? celsius b.)what is the rate of heat flow per square meter through this wall? /m^2