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In-Dash DIN-form-factor Car PC
kraksmokr writes "Xenarc Technologies have introduced a cool new in-dash DIN-form-factor Car PC. It features built in hard drive, audio/video, and GPS, among other things. Estimated price will be about $1200. I can't even begin to list the possibilities for mobile computing bliss." I'm even more impressed that they can fit it into the dash than I am with in-dash CD changers. If you buy this thing, use it safely. None of us want auto PC users to end up in the same category as annoying cell phone users.
If you're going faster than they are, you'd have to through the rock pretty fast. Probably at least as fast as the difference in your speeds.
momentum and all that.
The item would be travelling backwards, towards an object in motion forwards.
You throw an object at 5-10 MPH, it travels backwards towards an object travelling 30-40 MPH in the opposite direction. Even with the air drag your still gonna get it there without a problem.
You're neglecting the fact that you are throwing it from a moving position (your cycle is not stationary). Just to say up front I'm not trying to pick on you or anything. It might even be that we aren't talking about the same thing here.... so let's start with some descriptions.
You are traveling on your cycle at 50 mph. You toss a rock over your shoulder in the oppossite direction (behind you) at 5 mph. From the point of view of someone at a bus stop that you pass, the rock is moving in teh same direction you are, at 45 mph.
Now let's say you are traveling at 50 mph, and you pass some idiot talking on their phone. They are traveling in the same direction as you, at 40 mph (as we said, you're passing them). You toss a rock over your shoulder, at 5 mph. The rock, moving in the same direction as you at 45mph will never hit the car that you passed.
That was why I said you would have to throw it pretty fast, at least as fast as the difference in speed between your vehicle and the other. I'm ignoring drag, which would work to your advantage.