Find the reading of the spring balance is shown in the figure.
(take \(g=10~\text{m/s}^2\) )
1. \(60~\text N\)
2. \(40~\text N\)
3. \(50~\text N\)
4. \(80~\text N\)
1. | \(\dfrac g 3\) to left, \(g\) upward, \(g\) downward. |
2. | \(g\) downward. | zero, zero,
3. | \(g\) upward, \(g\) downward. | zero,
4. | \(g\) to right, zero, \(g\) downward. |