E R RR2
r
10. The voltmeter in the circuit at the
right may be considered to be ideal.
Values are,
E= 15.0 V; internal
resistance, r= 5.00 12; R,= 100 S2;
R = 300 12. Calculate the current in Ri.
(0.01406A)

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