An electric hot water heater takes cold water at its inlet pipe and delivers hot water at its outlet pipe. Between these two pipes is a large water container. Many electric hot water heaters have two separate heating elements: one near the top of the water container and one near the bottom.

a. After a new water heater is installed in the basement, the bathroom sink in a 2 story home keeps banging and shooting out water. What might have caused this and what can be done to fix this yourself?

 

 

A child’s toy oven uses an incandescent light bulb to bake cookies or cakes. It resembles a conventional oven, except that the heating element is simply a 60 W electric light bulb.

a. The light bulb is completely enclosed inside the oven and is barely visible from the outside. How does this work?

b. Some that is not a child’s toy is Nitinol. What is that, and how is it affected by temperature that is different from other metals?

c. The oven’s door locks when the oven is hot. The lock uses a horizontal bimetallic strip. How does this lock work?

 

A duck has a thick layer of fat just beneath its skin. In addition to making the duck more buoyant, this fat helps it stay warm in cold water.

a. Why does the duck have trouble maintaining its body temperature in cold weather?

b. Why does the duck have more trouble staying warm in cold water than in cold air?

c. How does the layer of fat help the duck keep warm?

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Status NEW Posted 05 Sep 2017 08:09 AM My Price 5.00

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