A child who is swimming toward shore at 0.78 m/s sees shark and picks up his speed to 1.89 m/s. He covers 17.5 m until he lands on shore. What was his acceleration?

What are the applications of electromagnetic waves

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.

Which is an example of an exothermic process?