- #1
phillia
- 3
- 0
Homework Statement
A lamp hangs vertically from a cord in a descending elevator that decelerates at 1.6 m/s2. (a) If the tension in the cord is 92 N, what is the lamp's mass? (b) What is the cord's tension when the elevator ascends with an upward acceleration of 1.6 m/s2?
Homework Equations
F=ma
The Attempt at a Solution
a) using M for mass, so as not to confuse it with 'm' for meters
F(net)=M*a, T-F(gravity) = M*a
92N - M*(9.8 * m/s^2) = M*(-1.6 * m/s^2)
9.8*M - 1.6 M = 92 kg
M = 11 kg
b)
T - (11 kg)*(9.8 m/s^2) = (11 kg)*(1.6 m/s^2)
T = 18N + 110N
T = 128N
Both of my answers are wrong. Where am I going wrong in my thought process?