Physics (including Earth and space sciences
Once you have chosen a topic, plan your essay to explore the question and develop a conclusion. The following three points are an example organization for your essay: (1) An introduction and motivation should describe the main question or topic, and brief
Provide an understandable definition of voltage, borrowing from the author’s analogy of water flowing downhill. In your description, include some exceptions to the general rule and how similar exceptions also occur in the case of charges and voltages.
Explain whether it is safe or dangerous to touch the wires in an electrical circuit. Describe what issues need to be considered, and what situations would change your advice.
Using the correct vocabulary of magnetism, describe what is happening inside paperclips when they are magnetized by a permanent magnet, and what is necessary to demagnetize them.
Describe polarization, and how the idea of polarization applies to both electric charges and magnets.
Explain some of the things in common between today’s hybrid cars (like the Prius) and a futuristic maglev train (with specific attention to electromagnetic propulsion and braking).
Did California make a mistake by approving high speed conventional trains instead of ones that use magnetic levitation? What are the advantages and disadvantages to using magnetic levitation in the next generation of transportation?
Explain some of the similarities and differences between cassette audio tapes and computer hard drives.
Explain some of the similarities and differences between the human ear and a conventional microphone.
Describe the main differences between how sound is recorded on audio tape and how it is recorded on an iPod. Include a clear description of the pros and cons of analog versus digital storage.
The text describes the difference between ‘analog’ and ‘digital’ numbers. Describe two practical situations, one where using digital numbers has an advantage over using analog numbers, and the other where the opposite is true. Explain your reasoning.