Câu1: Chất điểm khối lượng m = 0,5 kg chuyển động tròn đều với vận tốc 5 vòng /s. Tính mômen động lượng của chất điểm, biết bán kính quỹ đạo là 2m. A. 5 kgm2/s B. 10 kgm2/s C. 31,4 kgm2/s D. 62,8 kgm2/s Câu2: Một chất điểm có khối lượng m = 4kg, chuyển động tròn đều với vận tốc 2m/s. Tính momen động lượng của nó, biết bán kính quỹ đạo là 1m. A. 0,8kgm2/s B. 0,4 kgm2/s C. 8 kgm2/s D. 0,2 kgm2/s Gthik vì sao chọn đáp án đó

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