Archive for the ‘Physics’ Category

Why is metal heavier cold then when it is hot?

Metal Casting
shawn9600 asked:


I work in a steel casting company and I have noticed that if a large piece of steel is heated to a high temp. and left on a scale, as it cools it gets heavier.

Hobby Metal Casting

The casting of molten metal is important in many industrial processes. Centrifugal casting is used for?

Metal Casting
Lola asked:


manufacturing pipes, etc. a cylindrical enclosure is rotated rapidly and steadily about a horizontal axis. Suppose that a copper sleeve of inner radius 2.10cm and outer radius 2.20cm is to be cast. To eliminate bubbles and give high structural integrity, the centripetal acceleration of each bit of metal should be 100g. What rate of rotation is required? State the answer in revolutions per minute.

Metal Casting Information

Best metals for Induction Cooktops?

Metal Casting
abcdefg asked:


I don’t want brands, i need metals. I’m doing an assignment on Induction Cooktops, and need metals that would work.

I’ve looked all over the internet, but the only one i can find is cast iron, and i think i need more than that.

thanks in advance

Back Yard Metal Casting

How does heat move through metal as apposed to the air or water?

Metal Casting
brokolay asked:


There has to be a vast difference because when my cast iron stove is cold, it takes a long time to warm up. If it is even slightly warm from a previous fire it heats very quickly. The question I suppose I should be asking is how does heat as a form of radiation move through solid objects. Like the sun? Protons and neutrons bouncing around forever before they reach the surface?

Hobby Metal Casting

Best metals for Induction Cooktops?

Metal Casting
abcdefg asked:


I don’t want brands, i need metals. I’m doing an assignment on Induction Cooktops, and need metals that would work.

I’ve looked all over the internet, but the only one i can find is cast iron, and i think i need more than that.

thanks in advance

Backyard Metal Casting

Best metals for Induction Cooktops?

Metal Casting
abcdefg asked:


I don’t want brands, i need metals. I’m doing an assignment on Induction Cooktops, and need metals that would work.

I’ve looked all over the internet, but the only one i can find is cast iron, and i think i need more than that.

thanks in advance

DIY Metal Casting