Measure the diameter of a small coin. Then place the coin on a viewing area that is

It is well known that objects generally expand when heated. An iron plate gets slightly bigger, for example, when placed in an oven. But what of a hole in the middle of the plate? One friend may say the size of the hole will increase, and another may say it will decrease. a. What is your hypothesis about hole size, and if you are wrong, is there a test for finding out? b. There are often several ways to test a hypothesis. For example, you can perform a physical experiment and witness the results yourself, or you can use the library or internet to find the reported results of other investigators. Which of these two methods do you favor, and why?

Before the time of the printing press, books were hand-copied by scribes, many of whom were monks in monasteries. There is the story otthe scribe who was frustrated to find a smudge on an important page he was copying. The smudge blotted out part of the sentence that reported the number of teeth in the head of a donkey. The scribe was very upset and didn't know what to do. He consulted with other scribes to see if any of their books stated the number of teeth in the head of a donkey. After many hours of fruitless searching through the library, it was agreed that the best thing to do was to send a messenger by donkey to the next monastery and continue the search there. What would be your advice?

Measure the diameter of a small coin. Then place the coin on a viewing area that is perpendicular to the Sun's rays. Position the card so the image of the sunball exactly covers the coin. Carefully measure the distance between the coin and the small hole in the card. Complete the following: Diameter of sunball Distance of pinhole With this ratio, estimate the diameter of the Sun Show your work on a separate piece of paper.

If you did this on a day when the Sun is partially eclipsed, what shape of image would you expect to see?