variable-mass system معنى"variable-mass system" أمثلة على "system" معنى "variable" معنى "cepheid variable" معنى "global variable" معنى "irregular variable" معنى "mira variable" معنى "orion variable" معنى "process variable" معنى "public variable" معنى "random variable" معنى "state variable" معنى "variable (mathematics)" معنى "variable cost" معنى "variable costs" معنى "variable nebula" معنى "variable oystercatcher" معنى "variable quantity" معنى "variable retention" معنى "variable star" معنى "variable stars" معنى "variable wheatear" معنى "variable wind" معنى "alpha cygni variable" معنى "alpha2 canum venaticorum variable" معنى "average variable cost" معنى أمثلة There are different derivations for the variable-mass system motion equation, depending on whether the mass is entering or leaving a body (in other words, whether the moving body's mass is increasing or decreasing, respectively).
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