Halloween podcasting :D

Cartesian Divers. (Homework)

         A cartesian diver is a bottle that has some kind of object inside with water. Like a pipette, (what we used in class.) And you can make it float or sink or make it stay in the middle. During class, we learned that if the mass and the volume are the exactly the same amount, then the object would stay in the middle. But if the mass is the smaller number, the the object would float. And if the mass is bigger than the volume, the object would sink. We also learned about density during class and the average density of water should be 1g/cm3. If an object floats in the water, it has a density thats less than 1g/cm3. If an object sinks in the water, the density is more than 1g/cm3.  

We also learned about positive buoyancy, negative buoyancy, neutral buoyancy, and ballast. Positively buoyant means when the object is floating up. Meaning the density is more than 1g/cm3 and the mass is less then the volume. But negative buoyancy means the object is sinking and the mass is more than the volume. And the density is more than 1g/cm3. Liked you guessed, neutrally buoyant means the object is in the middle. Meaning the density is exactly 1g/cm3 and the mass is the same as the volume. Also, ballast means any material you use to help it sink. The density of something can change it you change the volume or mass. And the formula of getting density is if you draw a heart in between, the you would see a M or top and a V at the bottom. M stands for mass and V stands for volume. So the equation should be mass divided by volume. 

Photo credits: http://www.physics.isu.edu/physdemos/fluids/pics/cartdive_a.jpg

Math Reflections: Factors and Multiples

Questions:

#1: Common multiples help you if you with questions that contains having to find out the common multiple of something. A common multiple is a multiple that both numbers have as one of their multiple. For example, if I had the number 6 and 9, the common multiple of 6 and 9 would be 3. But common factors help you with questions that include with finding the common factors. One example would be if there was a ferris wheel that goes for 3 seconds per round while another goes for 4 seconds. And they asked you what's the fastest time they can meet, then you would keep on adding 4+4 or 3+3 until you get a number that matches. In this case, the answer would be 12.

#2a: You can find the common factors by adding up 4+4 or 3+3 if I had a question like that ferris wheel. You keep on adding it until you spot a number that they have in common. Like 12. 12 is not the greatest common factor because you can keep on adding it up until you get 100 or more!

#2b: It sometimes provide the answer for you depending on the question. Because if the question is asking you to look for the greatest common factor, then you already know your answer.

#3a: You can find the common multiple by adding up the multiples by itself over and over again until you get a number that both numbers have. You can find the least common multiple by doing the same thing, except it's the first number you get that they have in common.

#3b: The least common multiple can also provide you the answer because if it was like the ferris wheel problem, you would need to keep on adding it over and over again until you get the seconds/time of when they meet.

My favourite number project