Question

A beach erodes at a rate of 2cm per year. At this rate, what amount is it eroding in millimeters per hour

Answer 1

The amount eroded at millimetre per hour is 0.002283

In order to determine the answer, take the following steps :

1. determine how many hours are in a year

there are 24 hours in a day

There are 365 days in a year

Number of hours in a year = number of days in a year x number of hours in a day

24 x 365 = 8760 hours

2. convert centimetre to millimetre

1 cm = 10mm

2cm x 10 = 20mm

3. Amount eroded per hour in millimetres = amount eroded per year / total number of hours in a year

20 / 8760 = 0.002283 millimetre / hour

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