Kennewick Man's bones reveal his diet

A North American 9,000 years old skeleton reveals this man's diet.Proportions of certain forms of carbon and nitrogen in Kennewick Man’s bones denote a diet dominated by seafood.Kennewick Man may have belonged to a poorly understood Pacific Northwest coast population that continued to shun land prey for thousands of years after his demise, Schwarz said.A team led by Schwarcz concluded in 2014 that the bones of people who lived along the British Columbia coast over much of the last 6,000 years displayed chemical signatures of diets heavy on salmon and other fish, mollusks and marine mammals such as seals.

Alejandro Arias Zarzuela is named ambassador

A couple of months ago my dad was named ambassador by Danilo Medina. It was in
december 31 2014. My dad is ambassador from Dominican Republic in Brazil. When he came up with this news I was very impressed. Since then I've been very happy because my dad after alot of years of hardwork he could make what he desired. He is very happy to because of that and the whole family in the side of my dad and in the side of my mom. Ambassador is a person who represents the government of his or her country in other countries.

Types of forces

Gravity: is a force that pulls an object that has mass into the center of the earth
Friction: is a force that goes in the opposite direction of an sliding object
Balanced force: is when two objects with the same strength are pulling in opposite directions
Unbalanced force: is when two objects that do not have the same strength (one is weaker than the other)are pulling in opposite directions  

How do brakes work?

The hydraulic pressure that reaches each wheel's brake is then used to create friction to slow down and stop the vehicle: the harder you push on the pedal, the more pressure is applied to the brakes, eventually locking the wheels – that is if your vehicle if not equipped with an Antilock Braking System (ABS).

F=MA exercises

1. A car weighs 1000kg, you can push it .05 m/s², how much force (F) are you applying to the car? Here we use F=MA:

F= MA= 1000kg x 0.5 m/s2 = 50 m/s2

2. Another car weighs 2000kg, you can push it .05 m/s², how much force are you applying to the car? Again use F=MA.

F= MA= 2000kg x 0.5 m/s2 = 100m/s2

3. A force of 5000 newtons is applied to a 1200 kg car at rest. What is its acceleration? (m/s²)

A= M/S2= 5000n/1200kg = A: 4.16

4. A 10kg body has an acceleration of 2 m/s². Find the net force (F) acting on the body.

F= MA= 10kg x 2 m/s2 = 20 m/s2

5. An empty truck with a mass of 2500kg has an engine that will accelerate at a rate of 1.5 m/s². What will the force be if the truck is carrying an additional load of 1500kg?

F= MA= 2500kg + 1500kg = 5000kg x 1.5 m/s2 = 7500 m/s2

6. A force of 700 newtons is applied to a 600 kg bowling ball. What is the acceleration of the bowling ball once the force is applied?

A= F/M = 700n/600kg = 1.16

7. A baseball weighs 2.5 kg, after it is hit with a bat it has an acceleration of 36 m/s². How much force was used to make the ball travel that fast?

F= MA= 2.5kg x 36 m/s2 = 90 m/s2

8. During a car crash a bus that weighs 5000kg is hit by a semi truck, the bus moves at a speed of 8m/s². How much force was used to make the bus travel that fast?

F= MA= 5000kg x 8 m/s2 = 40,000 m/s2

9. Mr. G (80kg) is sitting in his favorite desk chair having fallen asleep from all the hard work he does; a disobedient student pushes Mr. G down the hall with an acceleration of 10 m/s². How much force would the student have to use to get Mr. G to move that fast?

F= MA= 80kg x 10 m/s2 = 800 m/s2

10. An old mousetrap car is sprung into motion and weighs 1000 kg. It is pulling a trailer with 1750 kg on it, travels with an acceleration of 20 m/s². What was the force of the mousetrap that enabled the car to move that fast?

F= MA= 1000kg + 1750kg = 2750kg x 20 m/s2 = 55,000 m/s2

Astronomy

I like astronomy because I would like to know if there are other planets that have similar live as us and I like to investigate about universe and know if there are aliens or other living things out there. I would like to know what's In the other side of a black hole. If we would travel faster than light I think we cult go to very far away planets and investigate their civilization and if they are more advanced than us or less advanced. I also like to know if we were created by aliens. I still think that they're watching us and investigating us.