A 70 kg student who is late to class runs up the stairs in 4.5 seconds to reach his class. If the stairs are 4 m high, how much power did the student expend? A. 62.2
B. 78.75
C. 609.8
D.771.75

Although longitudinal waves can travel through all media types what is the disadvantage of this type of wave transmission? a) he efficiency of he wave transmission is greatly diminished as the media becomes less dense b) the oscillation of one set of particles has a huge impact on neighboring particles c) particles become too close together as they bump into each other making it more likely to hit other particles down the line

What sort of waves exhibit the doppler effect?

Which describes an object in projectile motion? check all that apply.a.gravity acts to pull the object downb.the object moves in a straight path.c.the forward velocity of the object is 0 m/s.d.the object’s inertia carries it forward.e.the path of the object is curved.