What interaction of sound occurs when you scream into a pillow

A certain dam generates 120 MJ of mechanical (hydroelectric) energy each minute. If the conversion from mechanical to electrical energy is then 15% efficient, what is the dam's electrical power output in W?

Suppose that a pendulum has a period of 4.0 s at Earth's surface. If the pendulum is taken to the moon, where the acceleration due to gravity is much less than on Earth, will the pendulum's period increase, decrease, or stay the same?

How does newtons third law apply to gravitational force

g A satellite dish has the shape of a parabola when viewed from the side. The dish is 56 inches wide and 49 inches deep. How far is the receiver from the bottom of the dish if the receiver is placed at the focus?

For general projectile motion, which of the following best describes the horizontal component of a projectile's acceleration? Assume air resistance is negligible. -The horizontal component of a projectile's acceleration continually decreases.

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.

Who was the last person to step on the moon?