A 79.2-kg person stands on a scale in an elevator. What is the apparent weight when the elevator is (a) accelerating upward with an acceleration of 1.92 m/s2, (b) moving upward at a constant speed, and (c) accelerating downward with an acceleration of 1.89 m/s2
I was going to use the equation
FN = mg + ma in which we are given a and mg but I was not sure what to use for m.
(a) ma = - mg + N
N = ma+mg
(b) 0= - mg + N
(c) -ma = - mg + N
N =mg - ma
so is 79.2 kg the value for mass(m) or mg?posted by Hannah
Mass [s meeasured in kg.
Force (mg) - in Newtons.
m = 79.2 kg