A squirrel runs 15.0 m [N] and then turns and runs 8.0 m [W]. What is the squirrel's displacement? 1. 17 m [W 28° N]
2. 17 m [W 62° N]
3. 23 m [W 28° N]
4. 23 m [W 62° N]

Spend time observing or thinking about events that involve matter and energy. which events can you explain? which events can’t you explain?

The ratio of lift to drag l/d for a wing or airfoil is an important aerodynamic parameter, indeed, it is a direct measure of the aerodynamic efficiency of the wing. if a wing is pitched through a range of angle of attack, l/d first increases, then goes through a maximum, and then decreases. consider an infinite wing with an naca 2412 airfoil. estimate the maximum value of l/d. assume that the reynolds number is 9x10^6.

I'm thinking it's 2 you are asked to explain the earth's magnetic field. which is the best reply? 1. the earth's magnetic south is similar to the north pole of a magnet. 2. the earth's core has a strong magnetic charge similar to the south pole of a magnet. 3. the earth's geomagnetic south is similar to the south pole of a magnet. 4. the earth's magnetic charge is not centered at either pole; it varies based on location.