Đĩa tròn có khối lượng (DD + 80) kg, có bán kính quán tính đối với trục qua O là kO = 400 mm. Xác định vận tốc góc của đĩa sau khi nó quay được 20 vòng dưới tác dụng của lực P = 50 N. Đĩa chuyển động từ trạng thái đứng yên.

Apossible explanation for a set of facts that can be tested by further investigation is called

If the speed of a particle triples ,by what factor does its kinetic energy increase?

With the simplified model of the eye, what corrective lens (specified by focal length as measured in air) would be needed to enable a person underwater to focus an infinitely distant object? (be careful-the focal length of a lens underwater is not the same as in air! assume that the corrective lens has a refractive index of 1.62 and that the lens is used in eyeglasses, not goggles, so there is water on both sides of the lens. assume that the eyeglasses are 1.90