Each year thousands of children are badly burned by hot tap water. The figure be

Question

Each year thousands of children are badly burned by hot tap water. The figure below shows a cross-sectional view of an antiscalding faucet attachment designed to prevent such accidents. Within the device, a spring made of material with a high coefficient of thermal expansion controls a movable plunger. When the water temperature rises above a preset safe value, the expansion of the spring causes the plunger to shut off the water flow. Assuming that the initial length L of the unstressed spring is 2.45 cm and its coefficient of linear expansion is 22 multiplied by 10-6 (

Explanation / Answer

L = L T
L = 22*10–6 (2.45)29
L = 1.56 x 10-3 cm

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