Which of the following would lower the pitch of a string instruments sound

Hello, Johnsondakari

You see johnson when you have a very thick string the pitch of the string is very low and the thiner the string the higher the pitch do you understand?

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the moving of the box is a result of centripetal force. think of that  as a car or a truck in this case creates a turn, the force of friction performing upon the turned wheels of the car runs centripetal force obligatory for circular motion for the things inside it.