Mirrors .

1) About 3 images are produced .

2)The larger the angle , the number or images will be reduced .

3) Different mirrors reflect different kind of image due to the present of Convex/Concave mirrors , which change the image produced .

Physics graded assignment

1)How many images would you get for an object that is placed between two mirrors placed at an angle less than 90(degrees)?

There should be 2-3 images as more images are produced if the angles are smaller.

2) What happens to the images of this angle if it is bigger than 90(degrees)?

The number of images produced will decrease.

3) How do mirrors produce funny images?

This is because of mirrors known as convex and concave mirrors. Convex mirrors bulge outwards therefore making us look fatter while Concave mirrors bulge inwards making us look thinner.

Taken from:http://en.wikipedia.org/wiki/Curved_mirror

Part 3 31-39

1. Male seahorses get pregnant! Is this true? How?

Yes, it is true that male seahorses get pregnant! After the female and male seahorse have mated, the female seahorse inserts its ovipositor into the male's brood pouch and deposits dozens to thousands of eggs! The male then fertilizes the eggs inside his pouch.

2. Sound travels 15 times faster through steel than through the air. Why?

The molecules in a solid are arranged very closely together with little to no spacing at all. As the molecules in gas are arranged very far apart from each other, sound travels faster in it than in solids.

3. Infants blink only once or twice a minute while adults average around 10. Why do we blink so many times? What is the purpose of blinking?!

When we blink, our eyes secrete a liquid that helps to lubricate them and keeps our eyes from becoming dry. Blinking also protects our eyes from irritants as our eyelashes helps to ward off dust and other irritants. The reason why adults blink more than infants is because infants do not require as much eye lubrication than adults because of the small opening between their eyelids. Additionally, infants do not produce tears during their first month of life and they also sleep more than adults.

4. French kissing involves all 34 muscles in the face. Really? Which 34 muscles on the face? Show me a diagram and explain how it works!

[Can't find any information on this]

Invention of the QWERTY keyboard

The QWERTY keyboard was invented by Christopher Sholes and Amos Densmore in 1875. The difference between the QWERTY keyboard and the normal typewriter keyboard was that the most common letters were not so close together unlike the typewriter keyboard where the letters were arranged in alphabetical order. This was done so that the keys would not be jammed when the typist worked quickly.

Sholes claimed that the new arrangement was scientific and would add speed and efficiency. However, the only efficiency it had was to slow the typist down, since the typists fingers had to cover more distance to type.

Even so, the advantages of the keyboard far outweighed the disadvantages. Typists soon memorized the crazy letter arrangement and the QWERTY keyboard became a quick success.