Trên một nồi cơm điện ghi 220V -528W Tính cường độ định mức của dòng điện chạy qua dây nung của nồi

What is the most useful equation for electric power?

Consider a double atwood machine constructed as follows: a mass 4m is suspended from a string that passes over a massless pulley on frictionless bearings. the other end of this string supports a second similar pulley, over which passes a second string supporting a mass of 3m at one end and m at the other. using two suitable generalized coordinates, set up the lagrangian and use the lagrange equations to find the acceleration of the mass 4m when the system is released. explain why the top pulley rotates even though it carries equal weights on each side.

Explain what it means to view something from a frame of reference. provide an example that illustrates your explanation. (4 points)