The figure shows four forces exerted on a box. A square is shown with an arrow pointing up labeled F3, an arrow pointing right labeled F1, an arrow pointing down labeled F4 and an arrow pointing left labeled F2 If F1 is equal to F2 and F4 is greater than F3, which statement is correct? (3 points) a An unbalanced force will move the box up. b An unbalanced force will move the box down. c Several balanced forces will keep the box stationary. d Several balanced forces will keep the box moving towards the right.

If a sphere and a cure have the same mass and are propelled up a ramp with the same force, which would travel father up the ramp? explain.

Abookcase has a mass of 38 kg and the coefficient of friction between it and the floor is 0.82 what is the maximum force of friction between the bookcase and the floor a 372n b 305n c 412n d 449n

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.