A lever enables you to lift objects that are too heavy to lift byhand. The lever pictured here consists of a long board placed on apivot. To lift the concrete slab on the left end of the board, theperson pushes downward on the right end.

A. Using the concept of torque, explain why a lever makes it easierto lift the heavy slab. Hint: in order for the board to "swing"clockwise, thereby lifting the slab, how must the torque exerted bythe person on the board compare to the torque exerted by the slabon the board?

B. The slab weighs 1000 Newtons. The segment of the board to theright of the pivot is 5 times longer than the segment of the boardto the left of the pivot. Assuming the board is very light, howhard must the person push down on the right end of the board tolift the slab?

C. A student last year gave this explanation for why this leverworks:
"if you take the slab off the board, and if the student lets go ofthe board,the board will naturally swing clockwise; it ends up withits right end on the ground. thats because the weight of the boardto the right of the pivot is greater than the weight of the boardto the left of the pivot. My point is, even with the slab in place,the weight of the board "helps" the student make the board swingclockwise. Thats why the students force on the board can be lessthan the slabs weight"

In what ways do you agree or disagree with this explanation? hint:itll help to check for coherence between your answer here and youranswers to A and B.

PLEASE PLEASE PPLEAASEE HELP ME ANSWER THIS!! I HAVE ABSOLUTELY NOCLUE ON HOW TO START. BUT PLEASE ,IF YOU ANSWER THIS, BE GOOD ATEXPLAINING THOROUGHLY, MY TA WILL SERIOUSLY TAKE POINTS OFF FOR THESLIGHTEST THING. SORRY FOR SUCH LONG QUESTION. :/ THANKS IN ADVANCE

Math 1113 Fall 2017 . Fulk Project 2 Solve the following problems below individually or in groups of up to three. Each group will submit only one project. Each group member will also submit an explanation their contribution to the group project. Show all work leading to your solutions. To receive credit, you must clearly support you answers. Turn in on Wednesday, November 29 Points may be taken off for sloppy your project at the beginning of class disorganized, or poorly written work 1. (20 points) As viewed from the earth, the angle subtended by the full moon is s 0518Â°. Use this information and the fact that the distance AB from the earth to the moon is 236,900 mi to find the radius of the moon. (20 points) Variable stars are ones whose brightness varies periodically. One of the most visible is R Leonis; its brightness is modeled by the function b) -7.9-2.1 measured in days. a) Find the period of R Leonis. b) Find the maximum and minimum brightness c) Graph the function b. 2. where t is 3. (20 points) A movie theater has a 25-foot-high screen that is 8 feet above eye level. If you sit too close, your viewing angle is too small. If you sit too far back, the image is too small. If you sit x feet back from the screen, your viewing angle, Î¸, is given by Find the viewing angle, in radians, at distances of 5 feet, 10 feet, 15 feet, 20 feet, and 25 feet. Then graph the function in a graphing calculator with a viewing window of [0, 50, 10] by 10, 1, 0.1]. Use the calculator to find the distance at which you have a maximum viewing angle. [Hint: Viewing windows are written as [minmax Xscl by Dmin.Jmax Yscil. These values can be adjusted by pressing the WINDOW button on the calculator. To find a maximum, press 2ND TRACE, choose maximum, move to the left of the maximum and press ENTER, move to the right of the maximum and press ENTER, and then press ENTER again. (x-79j+12, (20 points) The number of hours of daylight in Boston is given by y-3sin where : s he number of days after lanuary 1. Within a year,when does Boston have 13.5 hours of daylight? Give your answer in days after January 1 and round to the nearest day. 4

Japanese 1036 Lecture 2: L2-Particle-MO-YO-NE-15-1

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