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 of the following are examples of a force? (choose as many as apply) (A.) friction (B.) weight (C.) speed (D.) acceleration

What is the driving force for the movement of solutes in the phloem of plants?

A synthesis reaction occurs when a substance breaks down into two or more simple substances. True False

How does the heat energy from the sun reach us through the vacuum of space? a. conduction b. radiation c. convection d. none of the above choices are valid

A new metal was discovered by a team of scientists. They have found that this metal Conducts electricity like all other metals. They took measurements of a sample of the new material. The mass of the sample was 0.

A conductor, with outer surface labelled a, contains a cavity, inner surface b. In this cavity there is a conducting sphere of radius r, and surface c. The sphere carries a charge of 1 C, while the conductor a charge of 2 C.

In a frictionless environment, which energy stays the same? 1. Kinetic Energy 2. Potential Energy 3. Internal Energy 4. Total Mechanical Energy

In what order do the earth, sun, and moon line up in a totla solar eclipse

17. Ice has a water. albedo than land or O A. similar O B. opposite O c. higher O D. lower

When you put your hands on a cold object like a glass of ice water your hands become?