알맞은 단어로 빈칸 채우기 1)물체가 한 번의 진동을 완료하는 데 걸리는 시간을
2)소리의 크기는 진동의 에 의해 결정됩니다.
3)주파수 단위는 입니다.
4)원치 않는 소리는 라고 합니다.
5)소리의 날카로움은 진동에 의해 결정됩니다.
I know you can't understand but let me say in English

1)time taken by an object to complete one oscillation is called
2)loudness is determined by the of vibration
3)the unit of frequency is
4)unwanted sound is called
5)shrillness of a sound is determined by the vibration

Adelivery truck leaves a warehouse and travels 2.60 km north. the truck makes a left turn and travels 1.25 km west before making another right turn to travel 1.40 km north to arrive at its destination. what is the magnitude and direction of the truck's displacement from the warehouse?

As you are trying to move a heavy box of mass m, you realize that it is too heavy for you to lift by yourself. there is no one around to , so you attach an ideal pulley to the box and a massless rope to the ceiling, which you wrap around the pulley. you pull up on the rope to lift the box. use g for the magnitude of the acceleration due to gravity and neglect friction forces. once you have pulled hard enough to start the box moving upward, what is the magnitude f of the upward force you must apply to the rope to start raising the box with constant velocity? express the magnitude of the force in terms of m, the mass of the box.

Calculate 9 ∙ 10-5 divided by 3 ∙ 10-9. (box after the "10" in answer is for the