Sound waves with a frequency above 20,000 Hz are referred to as

infrasonic waves

ultrasonic waves

sonic booms

doppler waves

An elevator is rising at constant speed. Consider the following statements: 1. the upward cable force is constant 2. the kinetic energy of the elevator is constant 3. the gravitational potential energy of the Earth-elevatorsystem is constant 4.

What are the five senses that we use to make observations in Science?

Are electrons, protons, or neutrons the smallest particles? if not, what are

Which structure's primary function is to warm and moisten the air? a. nasal cavity b. epiglottis c. bronchus d. bronchiole

A crane lifts a large cement slab weighing 2,200 n to a height of 15 m. what is the pe of the slab? remember, weight is measured in newtons (n), and is equal to mass times gravity.

An elevator weighing 15000 newtons s raised in 50 seconds. If the distance between stories is 3.0 meters how much power is required of the motor?

Given the diamond shape of a baseball field and the speed with which baseballs are hit, why is it harder for a hitter to hit a homerun to center field than to right or left field? (Consider the effect of air drag on fast moving projectiles.)

What is the arrangement of the forms of electromagnetic radiation according to their wavelengths?

A helium atom consists of two protons, two electrons, and two neutrons. In the helium atom, the strong force is a fundamental interaction between the (1) electrons, only (2) electrons and protons (3) neutrons and electrons (4) neutrons and protons

What is the term for water droplets that have accumulated in the air until they have become so heavy they have fallen back to earth?