Answer:
87 minutes of cycling are required to completely burn off the slice of pie.
Explanation:
Given:
Mass of fat in one slice of apple pie = 14.0 g
The fuel value for fat= 38 kJ/g
<u>Thus, the fuel value for fat in one slice of apple pie = 14×38 kJ = 532 kJ</u>
Mass of protein in one slice of apple pie = 2.00 g
The fuel value for protein= 17 kJ/g
<u>Thus, the fuel value for protein in one slice of apple pie = 2×17 kJ = 34 kJ</u>
Mass of carbohydrate in one slice of apple pie = 52.0 g
The fuel value for carbohydrate= 17 kJ/g
<u>Thus, the fuel value for carbohydrate in one slice of apple pie = 52×38 kJ = 884 kJ</u>
So,
<u>Total fuel value of one slice of apple pie = 532+34+884 kJ = 1450 kJ</u>
Also,
<u>1000 kJ</u> of fuel is burnt through cycling in <u>1 hour</u>
1 hour = 60 minutes
So,
<u>1000 kJ</u> of fuel is burnt through cycling in <u>60 minutes</u>
<u>1 kJ</u> of fuel is burnt through cycling in <u>60/1000 minutes</u>
<u>1450 kJ</u> of fuel is burnt through cycling in <u>0.06×1450 = 87 minutes</u>
<u>Thus, 87 minutes of cycling are required to completely burn off the slice of pie.</u>