An optician is prescribing glasses for an aging professor with a near point at 43.0 cm. if the distance from the cornea-lens system to the retina is 2.5 cm calculate the focusing power "p" (in diopters) of the eye when focused at the near point. what power "p" (in diopters) would the optician prescribe in order to provide reading glasses with a book held at the standard 25 cm distance?

If it takes a planet 2.8 x 10^8 s to orbit a star with a mass of 6.2 x 10^30 kg what is the average distance between the planet and the star

Which features on mars point to the possibility of liquid water on the planet? impact craters with sharp rims volcanic cones with craters gullies and stream-like channels mountain ranges with faults

Abird flies directly overhead from where you stand at an altitude of 300.0 m and at a speed horizontal to the ground of 20.0 m/s. the bird has a mass of 2.0 kg. the radius vector to the bird makes an angle \thetaθ with respect to the ground. the radius vector to the bird and its momentum vector lie in the xyxy-plane. what is the bird’s angular momentum about the point where you are standing?