The unit of energy is called the joule (J). Energy is measured in joules (J)
The joule is named after the English physicist James Prescott Joule. It is defined as the energy transferred to an object when a force of one newton acts on it through a distance of one meter. Other units of energy include the calorie (cal), the kilowatt-hour (kWh), and the British thermal unit (BTU).
The calorie is the amount of energy needed to raise the temperature of one gram of water by one degree Celsius. The kilowatt-hour is the amount of energy used by a 1,000-watt appliance in one hour. The British thermal unit is the amount of energy needed to raise the temperature of one pound of water by one degree Fahrenheit.
The joule is the most commonly used unit of energy in physics and engineering. It is also the unit of energy used in the International System of Units (SI).
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Mechanical waves are created when a source of energy causes a medium to vibrate or oscillate.
The medium refers to the material or substance through which the wave travels, such as air, water, or a solid object. When the source of energy, such as an object in motion or a disturbance, interacts with the medium, it transfers energy to the particles or elements of the medium.
As the energy is transferred, the particles within the medium start to move back and forth or up and down, transmitting the energy from one particle to the next. This collective motion of particles creates a wave that propagates through the medium. The wave carries the energy of the initial disturbance or source and can travel over short or long distances, depending on the properties of the medium.
Therefore, mechanical waves are formed when a source of energy imparts motion to a medium, causing its particles to vibrate and propagate the energy through the medium in the form of a wave.
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