For a country house located on its own, on a hill 880 feet over sea level, on very open space.
do not drive a mustang in the winter if u have to go out and buy a cheap beater off of craigslist and store the stang over the winter
A truly fun one would be finding the volume of a rock by placing it into a measuring cyclinder with water.
Here's The idea is that the laser must be pointing perpendicular to the case at all times. The case is filled mostly with water, but use a little milk to enable the laser path the be visible, but not totally destructive, you want the light to reach the focus. The math concept here is that a path perpendicular to a parabola's directrix will reflect from the parabola to the focus. This is how satellite dishes work. All the information is focused to the receiver. So I would have some object at the focus, preferably some red glass so the laser illuminates it and the light gets absorbed. As you move the laser light along it's track, it should always reflect to the focus. Materials, You will need a laser, some type of movable track, maybe a railroad model track? A shallow tank, not sure where I'd get one, try a hobby store. A fish tank may be too large. You can also TRY a plastic picture frame, I've seen ones about one inch thick and might be enough. Reflective material, possibly from home depot for reflective windows. This is what you will build the parabola with. Water and milk, about 10 % by volume should be okay. If not just add more water. Some base to ensure the track and case are always perpendicular.
