A sound system is designed to produce a 1.0W/m2 sound intensity over the surface of a hemisphere 20 m in radius. What acoustic power is needed from an array of speakers at the center of the sphere?

Ashley swam 20 miles in. 5 hours and 40 miles in an hour is it a proportional?

What is the mass of a dog if it accelerates at 15 m/s^2 and has a force of 50 N?

You whirl a stone in a horizontal circle in such a way that the stone is in uniform circular motion. Which of the following is true for this situation? A. The magnitude of the stone's velocity does not change. B.

In science, all concepts are a) opinions and facts. B) beleifs that are familiar and complicated. c) testable and observable. D) theories that cannot be proven.

Gauss's law is usualy written as: ∫Φ_E = E * dA = qencl / ε0 what does qencl refers in Guass's law? O the net charge inside the closed surface O the charge residing on insulators inside the closed surface O all the charge in the physical system O

How does the size of the sun compared to the size of other stars

List 2 carbon compounds found in organisms and their function/importance to the organism.

What happened on may 24 2002 in history

Match the characteristic or descriptive phrase to the type of application it describes. sound waves soft-tissue imaging electromagnetic wave fetal imaging

If a ball with an original velocity of zero is dropped from a tall structure and it takes 7 seconds to hit the ground, what velocity does the ball have when it reaches the ground? A. 34.3 m/s B. 68.6 m/s C. 156.8 m/s D. 240.1 m/s