Apoint source emits 28.9 w of sound isotropically. a small microphone intercepts the sound in an area of 0.214 cm2, 390 m from the source. calculate (a) the sound intensity there and (b) the power intercepted by the microphone.

Ateam of astronauts is on a mission to land on and explore a large asteroid. in addition to collecting samples and performing experiments, one of their tasks is to demonstrate the concept of the escape speed by throwing rocks straight up at various initial speeds. with what minimum initial speed vesc will the rocks need to be thrown in order for them never to "fall" back to the asteroid? assume that the asteroid is approximately spherical, with an average density p 3.84 x108 g/m3 and volume v 2.17 x 1012 m3 recall that the universal gravitational constant is g 6.67 x 10-11 n m2/kg2

According to newton’s first law of motion, which force is expected to cause a body to accelerate?

Describe the function of the endomembrane system? what organelles are involved?