Posted by **Afrah** on Thursday, November 24, 2011 at 12:55am.

A metal rod has a length of 4m at 50 degrees celcius and a length of 6m at 200 degrees celcius. What is it's length at 20 degrees celcius?

- physics -
**drwls**, Thursday, November 24, 2011 at 1:38am
Assume that expansion is linear with temperature change. Actually, this is often not the case. The thermal expansion mentioned is also much too high for metals. The thermal coefficient of expansion often varies a lot with temperature.

If a 150 deg C temp rise causes a 50% change in length, a 30 degree drop in temp will cause about a (1/5)*50% or 10% decrease in length. The new length will be 90 cm

## Answer This Question

## Related Questions

- ap chemistry - a cubic piece of uranium metal (specific eat capacity= .117 J/g ...
- physics - write down the formula and calculate the increase in length of a steel...
- science - What is the length of an aluminum rod at 65 degrees celcius if its ...
- Chemistry - Assuming complete dissociation of the solute, how many grams of KNO3...
- physics - a steel beam is 12.0 m long when installed at 23 degrees celsius.Find ...
- Grade 12 Chemistry - If 100g of zinc (c=377J/kg degrees celcius) at 95 degrees ...
- physics - A 2.8 kg gold bar at 99 degrees celcius is dropped into 0.21 kg of ...
- Physics - Which needs more energy: to heat 5 kg of copper from 20 degrees ...
- Chemistry 1 HN - Find the mass of iron heated to 85 degrees celcius that was ...
- physics - A construction worker uses a steep tape to measure the length of an ...

More Related Questions