According to the information in your study unit, which of the following locations requires the highest illuminance? a. a residential stairway b. a study area c. a school locker room d. a bank lobby 6. an object is located 51 millimeters from a diverging lens. the object has a height of 13 millimeters and the image height is 3.5 millimeters. how far in front of the lens is the image located? a. 1.12 millimeters b. 51 millimeters c. 189 millimeters d. 13.7 millimeters 7. which one of the following scientists did not study the properties of light? a. einstein b. newton c. kepler d. maxwell 8. the portion of a light ray that falls on a surface is a/an a. diffuse reflection. b. specular reflection. c. reflected ray. d. incident ray. 9. if the distance from a converging lens to the object is less than the focal length of the lens, the image will be a. virtual, upright, and larger than the object. b. virtual, upright, and smaller than the object. c. real, inverted, and larger than the object. d. real, inverted, and smaller than the object.

Amass m = 74 kg slides on a frictionless track that has a drop, followed by a loop-the-loop with radius r = 18.4 m and finally a flat straight section at the same height as the center of the loop (18.4 m off the ground). since the mass would not make it around the loop if released from the height of the top of the loop (do you know why? ) it must be released above the top of the loop-the-loop height. (assume the mass never leaves the smooth track at any point on its path.) 1. what is the minimum speed the block must have at the top of the loop to make it around the loop-the-loop without leaving the track? 2. what height above the ground must the mass begin to make it around the loop-the-loop? 3. if the mass has just enough speed to make it around the loop without leaving the track, what will its speed be at the bottom of the loop? 4. if the mass has just enough speed to make it around the loop without leaving the track, what is its speed at the final flat level (18.4 m off the ground)? 5. now a spring with spring constant k = 15600 n/m is used on the final flat surface to stop the mass. how far does the spring compress?