(a) For what downward acceleration does the spring scale in Figure P13.13 read zero?

(b) What would the answer in part \(a\) be if the experiment were done on the Moon?

(c) How would your conclusion about the spring forces change if the brick were hung from the spring scale rather than supported by it? (Ignore the weight of the spring.)

Data from Figure P13.13

on stationary floor in elevator accelerating downward brick Xo