Bettina spoke into a microphone during the school play to increase the sound of her voice so the audience could hear her speak. The loudness of Bettina's voice was changed by what type of energy?

You are given aqueous solutions of six different substances and asked to determine whether they are strong, weak, or nonelectrolytes. Describe how you could test the solutions.

A small rock is thrown vertically upward with a speed of 21.0 m/sm/s from the edge of the roof of a 21.0-mm-tall building. The rock doesn't hit the building on its way back down and lands in the street below. Ignore air resistance. A.

Scientists who possess this attitude question the results of experiments.

What is the de broglie wavelength of an object with a mass of 3.80 kg moving at a speed of 1.90 m/s? (useful constant: h = 6.63*10-34 js.) ?

David drinks a glass of water in his kitchen. The water is at room temperature, and David decides to make it colder by adding ice. Which of the following describes why the ice cubes will melt? A.

A thermometer measures its own temperature? What does it mean?

How do you find momentum

A 60-W light bulb and a 100-W light bulb are both rated at 120 V. Which light bulb has the larger resistance? the 60-W bulb

What is the innermost layer of the sun's atmosphere called?

Suppose 3 neutrons are released by an atom of U-235 in the first stage of a fission chain reaction. Each of these neutrons has enough energy to cause another fission reaction in another nucleus of U-235, releasing more neutrons.