Two small nonconducting spheres have a total charge of 93.0 μc . part a
when placed 1.14 m apart, the force each exerts on the other is 10.3 n and is repulsive. what is the charge on each?
q1,q2=

part b
what if the force were attractive?
q1,q2=

Abar magnet cut in half will form a total ofpoles. a)fourb)eightc)two

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

What is the efficiency of an engine that does 80 j of work and exhausts 320 j of heat while taking in 400 j of heat ? a. 10% b. 20% c. 80% d. 25%