The systems shown below are in equllibn'um. If the spring scales are calibrated in newtons, what do may read? Ignore the masses of the pulleys and strings and assume the pulleys and the incline are frictionless. {Let in = 2.51 kg and 6' = 29.0\".) scale in (a) :l N scale in (b) |:| N scale in (c) :l N scale in (d) |:| N