Plantary properties has a great lesson for your weight and age on other planets.
More than 25 hands-on science activities are provided in classroom-ready pages for both teachers and students for exploring Earth, the planets, geology, and space sciences.
A speaker is a device that converts an electronic signal into
sound. The speaker you will build (see figure 1) consists of a Styrofoam or
paper cup, a coil of wire, a permanent magnet, and a signal source. The
electronic signal goes through the coil and creates a varying electromagnet.
The attraction and repulsion between the electromagnet and the permanent
magnet cause the cup to vibrate and produce sound.
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