Một con lắc lò xo dao động điều hòa, khoảng thời gian giữa hai lần liên tiếp động năng bằng thế năng là 0.3 s. Tính khoảng thời gian ngắn nhất giữa hai lần liên tiếp động năng bằng 3 lần thế năng?

An experiment is designed to test the relationship between the initial height of a basketball before it is dropped to the height of its rebound bounce. the height of the rebound bounce is measured using a scale positioned behind the ball. in the above experiment, which condition would not be controlled? a). the starting height of the ballb). the surface the ball bounces on c). the type of ball d). the method to measure the rebound height of the ball

Which of the following is the result of the nuclear weak force? the instability of large nuclei the repelling force between positively charged protons the structure of the atom certain types of nuclear decay

What is the weight of a 8-kg substance in n, kn, kg·m/s2, kgf, lbm·ft/s2, and lbf?