A Student plucks a string on a guitar to play a note. How could the student make the sound softer? A. decrease the frequency by making the string longer.

B. decrease the amplitude by plucking with less force.

C. increase the amplitude by plucking with greater force.

D. increase the frequency by making the string shorter.

Samir watches a 100-minute movie on his spaceship. maria's spaceshipe flies in the same direction as samir's spaceship but she observes his move to last 125 minutes and his spaceship to be 40 m long. how long does samir observe his own spaceship to be? according to an observer on earth, planet x is stationary. maria and samir depart earth on their spaceships at the same time, each flying at 0.5c. maria flies toward planet x and samir flies in the opposite direction. according to maria, her voyage to planet x takes 9 years. how many years does marias voyage take according to samir?