tính % h2c2o4 trong mẫu, nếu cân 0,2g mẫu hòa tan vào 50ml dd. chuẩn dộ đ này trong môi trường axit hết 30,5ml KMnO4 0,10N

The famous scientist galileo galilei did several experiments with sloping planes, which he rolled metal balls down so that he could study motion. by changing the slope, he could study how the speed at which the ball rolled was affected. what was the independent variable in galileo's experiment? a. the speed of the ball b. the slope of the plane c. whether the ball moved d. what the ball was made of