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Far Horizon

An observer is on top of a lighthouse. How far from the foot of the lighthouse is the horizon that the observer can see?

Data Matching

Use your skill and judgement to match the sets of random data.

More or Less?

Are these estimates of physical quantities accurate?

What's That Graph?

Age 14 to 16 Challenge Level:
A 'temperature-time' graph has temperature on the vertical (y) axis and time on the horizontal (x) axis.
What would the temperature be after a short time has passed?
What would happen to the temperature as time passes?
A 'height-distance' graph has height on the vertical axis and distance on the horizontal axis...