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Một chất điểm dao động điều hòa với phương trình tọa độ x = Acos(ωt + φ). Gọi v và a là vận tốc và gia tốc của vật.
a) Chứng minh công thức: A2= x² + v² ÷ ω² và A² = a² ÷ ω⁴+ v² ÷ ω²
b) Cho biết thời gian để vật đi từ VTCB đến vị trí biên là 0,6s và lúc qua VTCB vận tốc của vật có độ lớn là 5π cm/s. Tìm A?
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Một chất điểm dao động điều hòa với phương trình tọa độ x = Acos(ωt + φ). Gọi v và a là vận tốc và g...
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