2. The figure below shows two isotropic point sources of sound, S1 and S2. The sources emit waves
in phase at wavelength 0.50 m. They are separated by D = 1.75 m. If we move a sound detector
along a large circle centered at the midpoint between the sources, at how many point do waves
arrive at the detector (a) exactly in phase and (b) exactly out of phase?

Acar drives toward the right over the top of a hill, as shown below. which arrow represents the centripetal acceleration? w x y z

You've already seen the value of 9.8 in this lesson. what's this value called? what quantity does it represent?

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