Usain Bolt is running around a circular curve on a flat track. The radius is 30 m, his speed is a constant 11 m/s, and his mass is 85 kg. Caicuiate the centripetai force that allows him to run around this curve.

15. one purpose of the tread pattern on a tire is to a reduce tire wear. b. reduce traction c. allow water to flow away from the tire. d. look impressive.

Which of the following is an example of units for speed

An electric current is flowing through the cord below.what will happen to this current if a magnet is brought near the cord? a. the electric current will stop flowing. b. it will exert a force on the voltage. c. the resistance of the wire will decrease. d. it will exert a force on the electric current.