Repetition or iteration.
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The amount of force multiplied by the distance an object is moved is called work. Work is a measure of energy transfer and is calculated as force multiplied by distance in the direction of the force.
The poles receive the least amount of solar energy per unit of surface area due to their high latitudes and extreme tilt away from the sun. These regions experience long periods of darkness during certain times of the year, resulting in minimal sunlight and lower energy absorption.
The frequency of something vibrating one million times per second is 1 MHz (megahertz).
Mass is a measure of the amount of matter in an object, weight is the force of gravity on an object. Weight is directly proportional to mass and gravity: (Weight = mass \times gravity). On Earth, gravity is relatively constant, so an object's weight is a good indicator of its mass.
The number of waves that pass a fixed point in a fixed amount of time is known as the "frequency".=====is called the Frequency of the waves (located on page 10 of the Penn Foster - Sound Study Guide)=====The number of waves that pass a given point per second is measured in units of Hertz (Hz). Hertz is a unit for cycles per second.The number of cycles that a wave completes in 'S' seconds is 'S' times its 'frequency'.