cho một máng nghiêng lấy 1 viên bi lăn nhanh dần điều từ đỉnh 1 máng với không vận tốc ban đầu , bỏ qua ma sát giữa vật và máng , biết viên bi lăn với gia tốc 1m/s biết vận tốc khi chạm đất là 4m/s . tính chiều dài máng và thời gian viên bi chạm đất

The ballistic pendulum was invented in 1742 by english mathematician benjamin robins. it consists of an initially stationary pendulum that moves after being struck by a bullet, and it is used to measure the original velocity of the bullet. the known variables are the bullet's mass m, the pendulum's mass m, and the height to which the block and bullet swing, determined by the length of the pendulum l and final angle θ. two principles of physics are necessary to solve for the bullet's original velocity. what are these principles? conservation of momentum and newton's third law conservation of energy and conservation of angular momentum grade summary deductions 0% potential 100% conservation of momentum and newton's second law. newton's second law and conservation of angular momentum. conservation of energy and newton's third law conservation of momentum and conservation of angular momentum. conservation of momentum and conservation of energy conservation of energy and newton's second law.

Which of the following are appropriate acceleration units?

Arrange the images in order to show how lake-effect snow occurs.