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In which of these investigations would pictures from a camera be most useful?

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Question generated: A worker needs to load a heavy box onto a truck. The worker uses a ramp to move the box because the ramp

Problem: Write a question you would see in a school textbook.

Answer: Which is an example of kinetic energy?

question: Write a question you would see in a school textbook. OPTIONS:
- At high elevations the ozone layer draws oxygen out of the atmosphere.
- The atmosphere is less dense at higher elevations so there is less oxygen available.
- Oxygen is heavier than the other gases in the atmosphere and sinks to lower elevations.
- Radiation from the Sun splits oxygen molecules into atoms making the oxygen unbreathable.
answer: Why do mountain climbers at high elevations use oxygen tanks to help them breathe?

An example of a grad-school level question?
According to the periodic table, all of the following are metals except

Random question?
Scientists measured the patterns of spectral lines given off by distant galaxies and concluded that almost all of these galaxies are moving away from Earth. What did the scientists observe directly?