Two identical converging lenses of focal length 100 mm are placed 400 mm apart, and an object 40 mm tall is placed 230 mm to the left of the left lens.

a. Draw a scale diagram showing the three principal rays for te left lens, and use them to locate the image formed by this lens.

b. draw the principle rays for the right lens, and use them the locate the image formed by this lens. is te image formed by the right lens

c. real or virtual?

d. larger or smaller than the object?

A1,200 kg car is accelerated at 3.7 m/s2. what force was needed to produce this acceleration? a. 4,440 n b. 324.3 n c. 4,388 n d. 304.3 n

In a wind tunnel the speed changes as the cross sectional area of the tunnel changes. if the speed in a 6' x 6' square test section is 100 mph, what was the speed upstream of the test section where the tunnel measured 20' x 20'? use conservation of mass and assume incompressible flow. conservation of mass requires that as the flow moves through a path or a duct the product of the density, velocity and cross sectional area must remain constant; i. e., that ova-constant. a model is being tested in a wind tunnel at a speed of 100 mph if the flow in the test section is at sea level standard conditions, what is the pressure at the model's stagnation point? (a) the tunnel speed is being measured by a pitot-static tube connected to a u- tube manometer. what is the reading on that manometer in inches of water? (b) at one point on the model a pressure of 2058 psf is measured. what is the local airspeed at that point?

Why does lightning travel from clouds to the ground?