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qduc92
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Bai1:Mot vat nho co khoi luong m=100g thuc hien dong thoi 2 dao dong dieu hoa cung phuong duoc bieu dien theo 2 phuong trinh,x1=3cos20t(cm) va x2=2cos(20t-\prod_{i=1}^{n}/3)(cm).Nang luong cua vat la bao nhieu?
Bai 2:Mot chat diem dao dong dieu hoa voi phuong trinh:x=4cos(4\prod_{i=1}^{n}t-\prod_{i=1}^{n}/6) (cm)
a,tim thoi gian de vat qua vi tri can bang lan 2008
b,..............................................................lan 2009
c,tim thoi gian de vat qua vi tri x=-2 lan 2008va lan thu 2009
Giup Minh Voi Nhe!!!
Bai 2:Mot chat diem dao dong dieu hoa voi phuong trinh:x=4cos(4\prod_{i=1}^{n}t-\prod_{i=1}^{n}/6) (cm)
a,tim thoi gian de vat qua vi tri can bang lan 2008
b,..............................................................lan 2009
c,tim thoi gian de vat qua vi tri x=-2 lan 2008va lan thu 2009
Giup Minh Voi Nhe!!!