Question

Imagine you are comparing the ability of electric hot plates of different sizes and temperatures to fully cook two identical large pots of spaghetti. Note that all the pots are as large as the largest hot plate. The color of each hot plate is used to illustrate its i emperature. 21 If you use two hot plates of the same size, can you assume that the hot plato tmat can cook a large pot of spaghetti first is at the higher temperature? Which letter example above supports your answer? For each pair of hot plates shown below, decide which one will cook the large pot of spaghetti more quickly Question 6 If you use two hot plates at the same temperature, can you assume that the hot plate that can cook a large pot of spaghetti first is larger? Which lettered example above supports your answer? High Question 7 If you use two hot plates of different sizes, can you assume that the hot plate that can cook a large pot of spaghetti first is at a higher temperature? Which lettered example above supports your answer? Question 8 Two students are discussing their answers to Question 7: Student 1: In 1D, the hot plate on the left cooks the spaghetti quicker than the one on the right oven though it is smaller. The hot plate's higher temperature is what makes it cook the spaghetti more quickly. Question 1 Student 2: But the size of the hot plate also plays a part in making it cook fast. If the hot plate on the left were the size of a penny, the spaghetti would take a really long time to cook. Ibet that if the size difference were great enough, the one at the lower temperature could cook the spaghetti first. Hot plate pair A. a) Loft b) Right c) Can't tell Do you agree with either or both of the students? Explain your reasoning. The time it takes for the spaghetti to cook is determined by the rate at which the hot plate transfers energy to the pot. This rate is related to both the temperature and the size of the hot plate. For stars, the rate at which energy is given off is called luminosity. Similar to the Question 2

Answer 1

Q5)

Hot plate pair A supports the answer. In the example, two plates of same size is shown although the temperatures are different. Hence, when two plates of same size and one of them can cook a large pot of spaghetti first, then it can be safely assumed that the plate that cooked large pot of spaghetti first, is at a higher temperature.

It can also be deduced by logical argument. Since the two plates are of same size (area is constant), the temperature per unit area would be same for both if temperature remains same. Now since one of the plates cook large pot of spaghetti faster, it means that it would more heat. Hence more heat translates into higher temperature since temperature is quantitative measurement of the heat.

In the Hot plate pair, A the right plate is at higher temperature than the left plate (notice the colour of both plates and relocate the colour significance in the temperature graph given at the side).