Homework 14 (July 18, 2013)

Group: The captain should email everyone to make sure they have a job pushing your project forward.  Email your wishlist to pcabuildingcommunity@gmail.com.  Work on the website – there should be the company name, mission statement and pictures/explanations of your first (and possibly second) prototype.

Use as much of the weekend as you can addressing your Individual Challenge.  You will need most of your class energy next week for your group project.  If you need programs for laser-cutting, you can download Illustrator and use the free trial (https://creative.adobe.com/products/illustrator). If you want to use the 3-D printer, use thingiverse.com and augment the object on Sketch-Up (remember to get the free version: http://www.sketchup.com/download)

Damocles picture “quiz” – have you been asking questions of each other, TAs and Triggs?  Start collaborating!

Requested Info:

ropes: 1/4 inch yellow polypropylene rope with a tensile strength of 5.5kN
boulder: 1 ton with a diameter of 1 foot and 8 inches
length of ropes: (can be determined using proportionality. Use the picture and remember that the diameter of the boulder is 1 foot and 8 inches)
The person, knots and wire can hold 10,000 pounds
The person can bench press twice his body weight (wow!)
Distance between person and boulder (can be determined using proportionality. Use the picture and remember that the diameter of the boulder is 1 foot and 8 inches)

The downward force of the weight: Weight is the force due to gravity. Since the gravitational force (weight) is between the rock and the earth, the force the rock experiences is towards the earth. The short answer is 1 ton (convert to Newtons, perhaps?)

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