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?
only the mass should be changed. the arm length should remain the same
the force applied to the mass should be varied for each trial
the material the arm is made of should be varied for each trial.
only the arm length should be changed. the mass should remain the same.

The great sandini is a 60.0-kg circus performer who is shot from a cannon (actually a spring gun). you don’t find many men of his caliber, so you him design a new gun. this new gun has a very large spring with a very small mass and a force constant of 1100 n/m that he will compress with a force of 4400 n. the inside of the gun barrel is coated with teflon, so the average friction force will be only 40.0 n during the 4.00 m he moves in the barrel. at what speed will he emerge from the end of the barrel, 2.50 m above his initial rest position?

Which property is expressed in distance units? o a. period o b. wavelength o c. speed o d. frequency

How many astronauts have walked on the moon?