What is the magnitude of the momentum of a 20 g sparrow flying with a speed of 8.1 m/s? kg·m/s?

20 g  = 20 / 1000 = 0.02 kg.

Magnitude of momentum of the sparrow = mass * velocity

= 0.02 * 8.1

= 0.162 kg-m/s.  (answer)

double the distance = divide strength by 4

the motion of a pendulum is a classic example of mechanical energy conservation. a pendulum consists of a mass (known as a bob ) attached by a string to a pivot point. as the pendulum moves it sweeps out a circular arc, moving back and forth in a periodic fashion.