Abob of mass of 0.18 kilograms is released from a height of 45 meters above the ground level. what is the value of the kinetic energy gained by the bob at the ground level?
a: 2.4 joules
b: 5.1 joules
c: 8.1 joules
d: 10.0 joules

Alfred pushes on a heavy box, but cannot move it. the box has a lot of inertia motion friction gravity

Which type of basaltic lava flow has a fairly smooth

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.