How much power is needed to lift a book to a height of 2.0 meters in a time of 1.0 second, if the book exerts a force of 20 Newtons?

Which simple machine is not part of this compound machine? a. lever b. pulley c. inclined plane d. wheel and axle

Which of the following statements comparing electron microscopy and light microscopy is false? which of the following statements comparing electron microscopy and light microscopy is false? both the electron microscope and the light microscope use the same wavelengths for illumination. images produced by light microscopes can be in color, whereas electron microscope images are black and white unless they are artificially colored. the electron microscope has greater resolution than the light microscope. electron microscopes can allow examination of viruses and internal cell structures, whereas light microscopes are limited to objects that are 0.5 micrometers and larger. request answer

Four friends, a, b, c, and d are standing varying distances away from a speaker which is producing sound waves.