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?

Which tool do we use to measure wind

What are found on the left side of the arrow in a chemical reaction?

For an object to orbit another object A. inertia must be greater than gravity. B. inertia and gravity must be balanced. C. inertia must be less than gravity.

In a football game, the running back takes a handoff and begins running toward midfield at 3.21 yards/s. As he moves through his linemen, he accelerates at a rate of 1.71 yards/s^2 to a velocity of 7.54 yards/s before he is tackled.

What is A common source of stress?

A flask that weighs 345.8 g is filled with 225 mL of carbon tetrachloride. The weight of the flask and carbon tetrachloride is found to be 703.55 g. From this information, calculate the density of carbon tetrachloride.

Why do people use Earth's motions to determine units of time?

Which of the following could be described as "Energy cannot be created or destroyed, only converted into other forms"? A. Rebound-crumple theorem B. Impulse-momentum theorem C. Law of conservation of energy D. Law of conservation of momentum

Which one of the following statements is true? 1. Burning coal contributes to sulfur aerosols in the stratosphere; these sulfur aerosols have moderated global warming. 2.

A diver on a diving board is undergoing simple harmonic motion. Her mass is 55.0 kg and the period of her motion is 0.800 s. The next diver is a male whose period of simple harmonic oscillation is 1.05 s.