Use the graph to explain why it may be essential to eat pasta prior to running a marathon.
An hour before a marathon, a runner eats a bowl of pasta to provide energy for the race. They know that it takes around 2.5 hours to complete a marathon.
When should this person take glucose tablets during the marathon?
A group of students investigated how long it takes a 200 mL beaker of water to cool from 1000C to room temperature (20-22oC). The data is represented in the graph below.
What was the rate of cooling between 30 and 120 seconds?
Why do you think the rate of cooling slowed after 120 seconds?