An object is placed 15.8 cm in front of a thin converging lens with an unknown focal length. if a real image forms behind the lens with an image distance of 4.2cm what is the focal length of the lens

You are driving directly behind a pickup truck, going at the same speed as the truck. a crate falls from the bed of the truck to the road. (a) will your car hit the crate before the crate hits the road if you neither brake nor swerve? (b) during the fall, is the horizontal speed of the crate more than, less than, or the same as that of the truck?

What effects result when there is an impact between earth and an asteroid? check all that apply. a. massive flooding. b. extinction of many life forms. c.major earthquakes change in average global temperature. d. giant dust cloud

What component of earth’s atmosphere exists entirely as a result of photosynthesis?