Đồng có 2 đồng vị trong tự nhiên: 63
29Cu
và
65
29Cu
, trong đó đồng vị
65
29Cu
chiếm 27% về

số nguyên tử. Phần trăm khối lượng của
63
29Cu
trong Cu2O có giá trị là

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