A 10.0 kg block resting on a frictionless surface is attached to an ideal spring with spring constant k. A 50.0 N applied force stretches the spring 100.0 cm from its equilibrium position. If the block is then released, what is its speed as it passes back through the equilibrium position

With the simplified model of the eye, what corrective lens (specified by focal length as measured in air) would be needed to enable a person underwater to focus an infinitely distant object? (be careful-the focal length of a lens underwater is not the same as in air! assume that the corrective lens has a refractive index of 1.62 and that the lens is used in eyeglasses, not goggles, so there is water on both sides of the lens. assume that the eyeglasses are 1.90

Select the correct answer. what does the process of natural selection involve?

Which of the following is a characteristic shared by both electron and light microscopes? a. they both employ the use of objective lenses. b. both microscopes require an internal camera to visualize the specimen. c. both microscopes have a resolving power of 0.01 nm. d. they both utilize white light to magnify the specimen.