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Date Posted: 07:05:37 12/10/02 Tue
Author: Becky
Author Host/IP:
Subject: Difference in energy spent - physics problem - help!

I've got a physics problem. I'm having problems finding some of the values I need. Bottom line question is this: What is the difference in energy spent hauling a trailer vs. not hauling one.

Perry, my Canadian friend doing the Race Around Australia, is hauling a BOB trailer. I would say that the average weight he is dragging along is 25 kg. It connects to the bike through the rear wheel skewer. It has one back wheel, size 16" x 1.75". While the roads there suck, for lack of good data, lets just assume he is on "normal" asphalt. Let's also assume that the tire is inflated properly to what pressure, I do not know. I also do not know the rolling resistance of said tire. Sigh. I'm looking all over for good data, but at this point, I'm stuck. I'm sure that I need these values, correct? I also need an equation. The speed at which he travels is probably 17 km/hr average.

I think I need the CdA - Drag Coefficient and Area, and the rolling resistance of the tires. I think I can get the A (area) with the dimensions of 64cm x 41cm x 46cm. Cd is a bit more difficult, requiring constants & variables alike.

Whew, I know this is asking a lot, but can anyone help me with this????


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