1) A street lamp weighs 157 N. It is supported equally by two wires that form an

Question

1) A street lamp weighs 157 N. It is supported
equally by two wires that form an angle of
111 with each other.
What is the tension of each of these wires?
Answer in units of N

2) If the angle between the wires is reduced to
71.3, what new force does each wire exert?
Answer in units of N

3) As the angle between the wires decreases,
what happens to the force exerted on the
wires?
1. increases, then decreases
2. decreases, then increases
3. unable to determine
4. remains constant
5. increases
6. decreases

Explanation / Answer

1. T = 157/(2cos(111/2)) = 138.593 N 2. T = 96.6 Newton 3. Option 6

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