Answer is A A velocity vs. time graph for an object is shown.
Which parts of the graph represents the object
moving at a constant, positive acceleration?
Velocity vs Time
O W and X
25
0 X and Y
20
Y
Y and Z
15
W and Z
Velocity (m/s)
10
Z
W
5
0
0
1
2.
3 4
5
Time (s)

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