Each planet has a 'planetary body' that are pretty much always hot when they are being created. As time passes, that internal heat that causes geological activity is slowly lost. Larger planet bodies are able to keep the internal heat longer than smaller planets, and that heat is needed to keep the planets geologically active.
The only way a smaller planet can retain any heat is from tidal friction coming from another planet. The constant friction from the external body keeps that small planet from going completely cold to the core due to its size. Hope this helps!! :)
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If the size and direction of the forces on the object are exactly balanced , then there is no net force acting on the object
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I don't have the answer but...
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A variable is a quantity that may change within the context of a mathematical problem or experiment. Typically, we use a single letter to represent a variable. The letters x, y, and z are common generic symbols used for variables.
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The process of producing electric energy or the amount of electric energy produced by transforming other forms of energy into electrical energy; commonly expressed in kilowatt-hours (kWh) or megawatt-hours (MWh). Electric power plant efficiency η is defined as the ratio between the useful electricity output from the generating unit, in a specific time, and the energy value of the energy source supplied to the unit in the same time period. For electricity generation based on steam turbines 65% of all prime energy is wasted as heat. The maximum theoretical energy efficiency is defined in more detail by the Rankine cycle. For modern practical systems this is about 40% but less for older generating plant. The efficiency falls still further if fuels with lower energy content such as biomass are used to supply the plant. The economics of power generation based on reciprocating engines depends to a large extent on the use to which the engine is to be put. The cheapest engines available are small petrol-driven engines based on car engines, which are manufactured in large numbers each year.
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