Fossil 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?
Give your answer to three significant figures

A26 cm object is 18 cm in front of a plane mirror. a ray of light strikes the object and is reflected off the mirror at a 42-degree angle. what is the angle of reflection? degrees what type of image is formed? what is the size of the image? cm

Choose the most likely outcome of this scenario: jen decided to go bike riding without a helmet. while no one is around during her ride, she is thrown from her bike when her wheel goes into a pothole. she is not injured, but she is terrified to get back on her bike. what happens next? a. her physical health is affected even though she wasn't hurt. b. her mental and emotional health are affected because she is afraid to get back on her bike. c. her social health is affected because she is worried her friends saw the fall. d. her overall health is not affected at all by her fall.

What is the equation for electrical work?