## Tuesday, September 6, 2011

### Tuesday, September 6, 2011

Today we began with this opener (pdf). We then explored direct and inverse variation via the relationship between the number of teeth on the front and rear sprockets of the gears of a bicycle and the number of wheel revolutions per pedal rotation (lesson, pdf).

Tonight's homework is:
1. In 2005 Lance Armstrong won the Tour de France for a record seventh time. Over the course of the race, his mean (average) speed was 41.7 km/h.

a) Find his mean (average) speed in ft/sec.

b) It took him 86 hours, 15 minutes and 2 seconds to complete the Tour de France. How many feet did he go?

If you're interested in cycling, then you might be interested in these videos - The Science of Cycling (part 1, part 2, part 3).

2. If you need help with direct and inverse variation, dimensional analysis, solving one-step equations, or blog posts, please, please, please (did I mention please?) come in and get some help. You might also check out your classmates' blog posts regarding direct and inverse variation. Of the ones I've seen so far, Alison's, Chey's and Nikki's are all good.