Harry the painter swings year after year from his bosun’s chair. His weight is 500 N, and the rope, unknown to him, has a breaking point of 300 N. Why doesn’t the rope break when he is supporting as shown on the left? One day, Harry was painting near a flagpole, and, for a change, he tied the free end of the rope to the flagpole instead of to his chair, as shown on the right. Discuss why Harry ended up taking his vacation early.
Harry the painter swings year after year from his bosun’s chair. His weight is 500 N, and the rope, unknown to him, has a breaking point of 300 N. Why doesn’t the rope break when he is supporting as shown on the left? One day, Harry was painting near a flagpole, and, for a change, he tied the free end of the rope to the flagpole instead of to his chair, as shown on the right. Discuss why Harry ended up taking his vacation early.
Harry the painter swings year after year from his bosun’s chair. His weight is 500 N, and the rope, unknown to him, has a breaking point of 300 N. Why doesn’t the rope break when he is supporting as shown on the left? One day, Harry was painting near a flagpole, and, for a change, he tied the free end of the rope to the flagpole instead of to his chair, as shown on the right. Discuss why Harry ended up taking his vacation early.
A cat burglar is planning a daring heist. He will lower himself from a beam as shown in the figure on the left. The burglar weighs 150 lbs. He plans to use a long rope that can withstand a tension of 100 lbs to suspend himself from a shorter rope, reasoning that each segment of the longer rope will only need to support half his weight. (The short rope segment is Kevlar and can easily support the burglar's full weight.)(a) Despite your moral outrage, you decide to set the burglar straight. Compute the tensions T1, T2, and T3 and explain why the plan will not work.(b) As a strictly intellectual exercise, you design an alternative arrangement of ropes that will support the burglar's weight using the same long rope from part (a). In the configuration on the right, what is the maximum angle fthat will result in a tension of less than 100 lbs in each segment of rope?You may ignore the mass of the rope in parts (a) and (b).
3 Cat Burglar
45°
T2
Tz
T.
A cat burglar is planning a daring heist. He will lower himself from a beam as shown in the figure on the left. The
burglar weighs 150Ibs. He plans to use a long rope that can withstand a tension of 100 lbs to suspend himself from a
shorter rope, reasoning that each segment of the longer rope will only need to support half his weight. (The short rope
segment is Kevlar and can easily support the burglar's full weight.)
(a) Despite your moral outrage, you decide to set the burglar straight. Compute the tensions T1, T2, and T3 and explain
why the plan will not work.
(b) As a strictly intellectual exercise, you design an alternative arrangement of ropes that will support the burglar's
weight using the same long rope from part (a). In the configuration on the right, what is the maximum angle e
that will result in a tension of less than 100 Ibs in each segment of rope?
You may ignore the mass of the rope in parts (a) and (b).
To give a 22-kg child a ride, two teenagers pull on a 3.1-kg
sled with ropes, as indicated in the figure (Figure 1). Both
teenagers pull with a force of 55 N at an angle of 35 ° relative
to the forward direction, which is the direction of motion. In
addition, the snow exerts a retarding force on the sled that
points opposite to the direction of motion, and has a magnitude
of 57 N. You may want to review (Pages 134 136).
Part A
Find the acceleration of the sled and child.
Express your answer using two significant figures.
Chapter 2 Solutions
Modified Mastering Physics with Pearson eText -- Standalone Access Card -- for Conceptual Integrated Science
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