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copedangyeu85
2 năm trước
Bài 3: Người ta đẩy thùng hàng nặng 6kg lên một mặt phẳng nghiêng có chiều dài 2m, cách mặt đất 1,5m trong thời gian 10 giây . a/ Tính công của lực nâng thùng hàng ? b/ Tính lực kéo tác dụng lên thùng hàng ? c/ Tính công suất của người nâng thùng hàng ? Bài 4: Người ta dùng máy kéo để đưa một vật 800N lên độ cao 12m thì mất 4 phút. Tính: a/ Công thực hiện của máy ? b/ Công suất của máy ? c/ Vận tốc vật đi lên ?
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