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iqbaldadarkar
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1. How much weight is required to be dropped from 1 meter height so that on impact on ground will give 9 Joules of energy
Energy is measured in joules (J). Joules are a unit of measurement for energy, work, and heat.
A joule is defined as the amount of energy required to exert a force of one newton through a distance of one meter.
Energy and work are closely related. Work is the transfer of energy from one system to another. In other words, when work is done on an object, energy is transferred to that object.
Joules are commonly used to measure the energy in food. For example, a typical candy bar contains about 1,000 joules of energy. Other examples include the energy produced by a car engine, the energy used in household appliances, and the energy in a lightning bolt.
Joules can be converted to other units of energy such as calories, kilowatt-hours, and British thermal units (BTUs). For example, 1 joule is equal to 0.000239005736 calories, 2.77778e-7 kilowatt-hours, and 0.947817 BTUs.