# physics

posted by .

A copper bar is initially 20 cm long at 10 degrees C. It is then heated to a temperature of 40 degrees C. What will be its new length?

• physics -

L = Lo * k*Lo (T - To).
L = 20 + 1.7*10^-5*20(40 - 10),
L = 20 * 0.01020 = 20.01020cm.

• physics -

CORRECTION: L=20 + 0.01020=20.01020cm.

## Similar Questions

1. ### Chemistry

In order to raise the temperature of 5.0 Kg of water from 20 degrees C to 30 degrees C,m a 2.0 Kg iron bar is heated and then dropped into the water. what should the starting temperature of the bar be?
2. ### calculus

A cold metal bar at -30 degrees Celsius is submerged in a pool maintained at a temperature of 40 degrees Celsius. Half a minute later, the temperature of the bar is 20 degrees Celsius. How long will it take the bar to attain a temperature …
3. ### science

An aluminum bar is 2m long at a temperature of 20 degrees C What will be the length of the bar at a temperature of 100 degrees C
4. ### physics

a 2.00kg copper plate with an initial temperature of 20.0 degrees Celsius slides with a constant velocity down a 150m long surface that is inclined at 30 degrees angle to the horizontal. If the mechanical energy lost by the system …
5. ### physics

a .300 kg piece of metal is heated to 88 degrees celsius and placed in a copper calorimeter with a mass .150 kg which contains .500kg which contains .500 L of water that are both initially at 12.6 degrees celcius. Over short period …
6. ### Calculus

I do not understand what this question is asking and how to get the result for it: "Suppose we have a metal bar of length L0 metres at temperature T0 in degrees Celsius.When the bar is heated or cooled, the length of the bar changes. …
7. ### Physics

A copper wire that has been heated to 520 degrees Celsius for pliability is plunnged into 350 mL of water at 18 degrees Celsius. The final temperature of the copper and water bath is 31 degrees Celsius. Find the mass of the copper …
8. ### Physics

A copper wire that has been heated to 520 degrees Celsius for pliability is plunged into 350 mL of water at 18 degrees Celsius. The final temperature of the copper and water bath is 31 degrees Celsius. Find the mass of the copper wire