Vật dao động điều hòa dọc theo trục Õ (với O là VTCB),CÓ CHU KÌ T=2s và biên độ A . Thời điểm 2.5s vật ở li độ cực đại .Tại thời điểm ban đầu vật đi theo chiều gì

Which of the following are properties of mechanical waves? check all that apply ⭕️ particles of the medium move back and fourth, but do not move with the wave. ⭕️ the particles of the medium always move parallel to the wave motion. ⭕️ wave motion begins with a disturbance in the medium. ⭕️ waves transport energy from a source outward, away from the source.

Simple machines can a. increase force only b. decrease force only c. increase or decrease force

Alead ball is dropped into a lake from a diving board 5m above the water . it hits the water with a certain velocity and then sink with constant velocity in bottom . it reaches the bottom 5 second after it is dropped if g= 10m/s2 . find depth of the lake and average velocity of the ball ?