Physics 101 Introduction to Mechanics 

January 16  



Let's
consider a evening at the beach. What happens at sunset? Would
your friend sitting on the balcony of his beachfront apartment (10 stories
up), see the sunset at the same time as you (while on the beach)?
Let's label the radius of the earth (r), the difference in height between you on the beach and your friend upstairs (h), the angle formed between the two "horizons" (which is also the same angle betweent he sun's two positions) and a useful distance d.
Write two expressions for d one in terms
of r & h and the other in terms of r and q.
Write an expression q
for in terms of the time difference between sunsets, t. (Hint: how long
does it take for the sun to travel in a full circle? Can you use
this in a ratio with the partial circle (q)
shown here?) Then combine the equations to find r in terms of the
time difference between sunsets and the height difference, h.


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