**STEM CHALLENGE WEEK 3/15-18**

Here is the link with detailed STEM CHALLENGE WEEK Q and A

Question for 3/15

All matter fits into (3) categories: elements, compounds and mixtures. A compound is made of two or more elements that can only be separated chemically. A compound cannot be separated mechanically ( w/ hammer or boiling). Water is a compound made of two elements, can you name them? Put the answer on the back page of this slip and sign your name. Return tomorrow in your red folder.

ANSWER: Hydrogen and Oxygen, H20

Question for 3/16

The online game AI Dungeon uses one of the largest computer brains ever created – the “artificial neural network” called GPT-3, which learned how to imitate human speech by reading the internet.

Brains are made of billions of cells called neurons, which interact through connections called “synapses.” GPT-3 has more than 100 billion artificial synapses, but your brain has more than 100 trillion synapses.

If computer brains follow the trend called “Moore’s Law,” which means that every two years they get twice as powerful, then how long will it be before computers are smarter than people? Write your answer on the back along with your name, and turn in this paper tomorrow in your red folder.

ANSWER: 20 years: the brain has to get 1,000 x bigger, which means it has to double 10 times. 2^10 = 1024 and it doubles every 2 years.

Question for 3/17

Renewable energy is made from sources that can be regenerated. Sources include solar, wind, geothermal, biomass, ocean and hydro. Windmills have been used to convert the kinetic energy in the wind into mechanical energy. Modern wind turbines have generators that convert mechanical energy into ___________. Fill in the blank here, and write your name on the back of this sheet. Please return in your red folder tomorrow.

ANSWER: Electricity

Question for 3/18

What is the Sum of the numbers 1-100? 1 + 2 + 3 + 4 + … + 98 + 99 + 100

Clue: The question relates back to a famous mathematician, Gauss. Check out how he split the numbers into two columns (1-50, and 50-100) to get the sum of a series. Write your answer on the back of this slip along with your name, then return tomorrow in your red folder.

ANSWER: 50 X 101= 5050. You can get this by splitting into two groups (1-50) and (51-100)

1 + 100 = 101 2 + 99 = 101 3 + 98 = 101

48 + 53 = 101 49 + 52 = 101 50 + 51 = 101

When looking for the sum of a sequence, we call it a series. Gauss, developed a formula we can use to find the sum of a series:

S is the sum of the series and n is the number of terms in the series, in this case, 100.