Xét một cái hộp trượt có ma sát trên một bề mặt nằm ngang. nếu hệ là bề mặt nằm ngang thì hệ là a) không cô lập
b) cô lập
c) không thể xác định được

Which of the following is a source of heat for magma formation? magma plumes in the continental crust friction due to divergence friction due to subduction magma plumes in the oceanic crust

When you jump from an elevated position you usually bend your knees upon reaching the ground. by doing this, you make the time of the impact about 10 times as great as for a stiff-legged landing. in this way the average force your body experiences is a) less than 1/10 as great. b) more than 1/10 as great. c) about 1/10 as great. d) about 10 times as great.

Sort the images based on whether there's a force of attraction or repulsion between the magnets shown. attraction repulsion