# Tutor profile: Ryan A.

## Questions

### Subject: World Geography

What are the capitals of the 5 largest countries in the world by land area?

First what are the 5 largest countries in the world by land area: Russia, Canada, United States, China, and Brazil (not in any specific order). And now the capitals: Russia - Moscow Canada - Ottawa United States - Washington DC China - Beijing Brazil - Brasilia

### Subject: Physics

What is the tangential velocity of a point on the edge of a disk spinning at 2 radians per second with a diameter of 4 meters?

Equation: Vt=r*W where Vt is tangential velocity, r is the radius, and W is angular velocity. Find r: r=d/2 where d is diameter. r=4/2=2 meters. Find W: W =2 radians per second Solve: V/t=2 meters *2 radians per second=4 meters per second.

### Subject: Algebra

Solve the following system of equations. x+y=10 2x-y=8

Isolate one variable: (x+y=10)+(2x-y=8)=(3x=18) Solve for x: (3x=18)->(3x/3=18/3)->(x=6) Solve for y: (x+y=10)->(6+y=10)->(6+y-6=10-6)->(y=4) Solution: x=6 and y=4

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