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 arm length should be changed. the mass should remain the same.
b. the force applied to the mass should be varied for each trial.
c. only the mass should be changed . the arm length should remain the same.
d. the material the arm is made of should be varied for each trial.
(i know there’s some spelling errors but that’s the exact question my teacher gave me)

i'm thinking more like energy

it takes about 30 days for it to break down

15.3 cos 65 degrees trig

as we probably am aware that our atmosphere or air have various levels, each level has different gasses, and each gas has another porousness. at the point when the light originates from lower porousness to higher penetrability, it alters its course. with the goal that implies that when the light originates from the moon to the earth, it alters it's course a lot more occasions. it essentially implies that the state of the light piece of the moon is changed on the earth.

not copied too! hope this !

joke:

h o h o hope you have a merry christmas!