Speakers a and b are vibrating in phase. they are directly facing each other, are 8.2 m apart, and are each playing a 78.0 hz tone. the speed of sound is 343 m/s. on the line between the speakers there are three points where constructive interference occurs. what is the distance of the farthest point from speaker a?

Consider an ordinary, helium-filled party balloon with a volume of 2.2 ft3. the lifting force on the balloon due to the outside air is the net resultant of the pressure distribution exerted on the exterior surface of the balloon. using this fact, we can derive archimedes’ principle, namely that the upward force on the balloon is equal to the weight of the air displaced by the balloon. assuming that the balloon is at sea level, where the air density is 0.002377 slug/ft3, calculate the maximum weight that can be lifted by the balloon. note: the molecular weight of air is 28.8 and that of helium is 4.

What kind of simple machine is a catapult?

Distinguish between linear momentum and angular momentum