Afossil evidence has revealed that prehistoric dragonflies could be as much as 10 times the size of the dragonflies existing today (the linear dimensions of the prehistoric draglonfly were 10 times that of existing dragonflies). the modern dragonfly sympetrum sanguineum has a typical mass of 125 mg. what was the mass of the prehistoric dragonfly?

125g

Explanation:

We know that if we increase the linear dimensions of an object by a factor , its sufrace dimensions will increase by a factor , and its volumetric dimensions will increase by a factor , so if the modern dragonfly has a volume V, the prehistoric one has a volume . We will assume that the density of both animals are the same, and since the mass is given by the formula this means that the mass of the prehistoric dragonfly is also times bigger than the mass of the modern one, so our answer is 1000*125mg=125000mg=125g.

with the invention of the automobile, the woman of the house could drive to the store and get groceries. women were also free to socialize more. during world war ii women were allowed to work in factories to the war effort and could drive to work or ride mass transit buses to their jobs.

the small 0.38-kg slider is known to move from position a to position b along the vertical-plane slot. determine (a) the work done on the body by its weight and (b) the work done on the body by the spring. the distance r = 0.70 m, the spring modulus k = 154 n/m, and the unstretched length of the spring is 0.53 m

explanation:

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