An experiment is conducted to determine how the arm length of a pendulum affects its period. The experimental design calls for varying the length of the arm and the mass of the bob. Which is true about this experiment, based on good experimental design?

A.) Only the mass should be changed. The arm length should remain the same.

B.) The force applied to the mass should be varied for each trial.

C.) Only the arm length should be changed. The mass should remain the same.

D.) The material the arm is made of should be varied for each trial.

grav forces affect all objects magnetic forces affect magnetic objects and electric currents

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.

the chart show the masses and velocities of two colliding objects that stick together after a collision.

according to the law of conservation of momentum, the momentum of the object after the collision is  

answer

1,500

kg • m/s.