1. A new 75 m long concrete footpath is constructed down a street. Estimate how

Question

1.

A new 75 m long concrete footpath is constructed down a street. Estimate how
many 2 cm thick expansion joints are required to accommodate the change in length of
the path from the coldest midwinter’s night to the hottest summer’s day.

2.

a)

If 70.8% of Earth’s surface is covered in water then how much energy is required to
heat the top 50 m of this water by 3 ºC?
b)

Assuming the Sun delivers an average of 1.2 kW m-2
to the side of Earth facing the
Sun (think about what this means geometrically) and assuming no heat loss, how long
will it take to for the heating in part a) to occur?

Explanation / Answer

repost it please

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