4 Select the correct answer.
Which of the following is TRUE about the backhand hit?
ОА
The backhand hit should always be performed with two hands.
OB.
The backhand hit can be performed with one or two hands.
OC.
You should switch the hand holding the racquet for the backhand hit.
OD
You should overextend your elbow when hitting the ball.
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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