Draw a ray optics diagram, except now replace the magnifying glass with your human eye lens, and replace the leaf with your retina that rests at the back of your eyeball. Once again, label s, s’, and f with symbols.

Given that the distance between the eye’s lens and the retina is around 2cm, relabel s, s’, and f with their exact distances. (Note: you can automatically know the focal length (converging strength) of your human eye when you look at something far away, because you can approximate the object distance as infinitely far away.)

Explain why we need a lens in our human eye in order to focus light from an object onto our retina. (ie: an invertebrate with photoreceptors but no lens would see a brighter spot where the light is, but would not be able to focus the edges of the panels and rectangular shape of the light holder.)

Askydiver weighing 140 lb (including equipment) falls vertically downward from an altitude of 19,000 ft and opens the parachute after 18 s of free fall. assume that the force of air resistance, which is directed opposite to the velocity, is of magnitude 0.55|v| when the parachute is closed and is of magnitude 14|v| when the parachute is open, where the velocity v is measured in ft/s. assume that acceleration due to gravity has magnitude 32 ft/s/s; remember that weight is the product of mass and gravitational acceleration. (a) find the speed of the skydiver when the parachute opens. (b) find the distance fallen before the parachute opens. (c) what is the limiting velocity vl after the parachute opens? (d) determine how long the sky diver is in the air after the parachute opens. (e) plot the graph of velocity versus time from the beginning of the fall until the skydiver reaches the ground.

Waves that cause the most damage during an earthquake are a. surface waves c. s waves b. p waves d. ocean waves

Aplayground merry-go-round has a radius of 4.6 m and a moment of inertia of 200 kg-m2 and turns with negligible friction about a vertical axle through its center. a child applies a 26.0 n force tangentially to the edge of the merry-go-round for 15.0 seconds. if the merry-go-round is initially at rest, how much work did the child do on the merry-go-round?