Three crates with various contents are pulled by a force Fpu" = 3555 N across a horizontal, frictionless rollerconveyor system. The group of boxes accelerates at 1.612 m.I's2 to the right. Between each adjacent pair of boxes is a force meter that measures the magnitude of the tension in the connecting rope. Between the box of mass m j and the box of mass mg, the force meter reads Fm : 137'8 N. Between the box of mass m; and the box of mass mg. the force meter reads F33 : 225'? N. Assume that the ropes and force meters are massless. What is the total mass of the three boxes? What is the mass of each box? A race car rounds one end of a speedway. This end of the track is a turn with a radius r of approximately 13? ft. If the track is assumed to be completely flat and the race car is traveling at a constant ll mi] around the turn, what is the race car's centripetal (radial) acceleration ac? a: = W51 Convert this result to SI units. a: = W51 What is the force responsible for the centripetal acceleration in this case? O weight 0 normal 0 friction O gravity To keep from skidding into the wall on the outside of the turn. what is the minimum coefcient of static friction M between the race car's tires and the track\"? is . A spring hangs from the ceiling with an unstretched length of x\". = 0.91 111. A m] = 6.3 kg block is hung from the spring. causing the spring to stretch to a length x. = 1.13 m. Find the length x: of the spring when a m; = 3.? kg block is hung from the spring. For both cases, all vibrations of the spring are allowed to settle down before any measurements are made