distance is measured in light years
For example : Distance between sun and Earth
A light-year, also light year or lightyear (symbol: ly) is a unit of length, equal to just under 10 trillion kilometers (10×1015 meters, 10 petameters or about 6 trillion miles). As defined by the International Astronomical Union (IAU), a light-year is the distance that light travels in a vacuum in one Julian year.
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distance is measured in light year
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answer. Light-year. The light-year is a unit of length used to express astronomical distancesand measures about 9.5 trillion kilometres or 5.9 trillion miles. As defined by the International Astronomical Union (IAU), a light-year is the distance that light travels in vacuum in one Julian year (365.25 days).
Length is the physical quantity which is related to the unit light year. Light year is an unit which describes the distance travelled by light rays in the time period of a whole year.
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derive an expression for the potential energy of the body.
potential energy is the energy possessed by a body by virtue of its state of rest or deformed state i.e, the energy of an object due to its position or arrangement in a system is called potential energy.
it is further classified into gravitational potential energy (gpe) and elastic potential energy (epe). gpe is by virtue of height of a body from a reference level. the gravitational potential energy of an object is the work done in raising it from the ground to a certain point against gravity.
it can be expressed as gpe = mgh (where, m is mass of the body, g is the acceleration due to gravity and h is the height of the body from the reference level)
gravitational potential energy, p.e = mgh
if the height, h of a body is considered from the ground, then the gravitational potential energy of the body, p.e = mgh
if the height of the body is raised from a height, h to the other height, h the gravitational potential energy of the body is p.e = mg(h-h)