What is the work done by a 20 newton force applied at an angle of 45.0° to move a box a horizontal distance of 40 meters? 8.0 × 102 joules 9.0 × 102 joules 5.6 × 102 joules 3.6 × 102 joules

If forces acting on an object are unbalanced, which factors may result fron an unbalanced force? check all that apply

50 g of ice at 0°c is dropped in a beaker containing 100 g of water at 0°c. what will be the contents of the beaker after 5 hours? assume that the room temperature is 0°c.

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.