The number, N, of people who eventually hear a rumour spread by the mass media by time t, in days, is given by the formula N = a(1−e^(−k*t)) for positive numbers a and k. Suppose 5, 000, 000 people hear a rumour eventually. Further, 10% of them heard the rumour in the first day. Find the values of a and k. What percentage of people heard the rumour on the second day?
Water boils at 100oC at sea level pressure.
Select the situation(s) where water will boil at greater than 100oC.
Select one or more:
a.
Inside a pressure cooker.
b.
In Armidale, New South Wales (980 metres high).
c.
Inside an evacuated vacuum chamber where the pressure is 10−5 atmospheric pressure.
d.
In the eye of a cyclone or hurricane.