The potential energy of a flying bird is 30.7 J. The kinetic energy of the bird is 128.4 J. What is the bird's Mechanical Energy?

In a simplified model of the human eye, the aqueous and vitreous humors and the lens all have a refractive index of 1.40, and all the refraction occurs at the cornea, whose vertex is 2.60 cm from the retina. what should be the radius of curvature of the cornea such that the image of an object 40.0 cm from the cornea’s vertex is focused on the retina?

The frequency of the fundamental of the guitar string is 320 hz. at what speed v do waves move along that string?

Abowling ball rolling down the lane toward the pins has gravitational potential energy. a. no b. a lot of c. a little