Aconcert loudspeaker suspended high off the ground emits 29.0 w of sound power. a small microphone with a 0.500 cm2 area is 55.0 m from the speaker. how much sound energy impinges on the microphone each second?

10 newton object is placed 3 meters from the fulcrum. at what distance on the other side would you need to place a 15 newton object to balance the lever? show your work!

Which best describes how fluids change as they travel through different portions of the convection currents? they change to solids at the outer portion of the convection currents. they change to solids at the inner portion of the convection currents. they become more dense at the outer portion of the convection currents. they become more dense at the inner portion of the convection currents

Which accurately compares concave and convex lenses?