# physics

posted by .

A steel rod of length 4 m is welded to the end of an aluminum rod of length 3 m (lengths measured at 23 °C). The combination rod is then heated to 198 °C. What is the length of the combination rod at 198 °C? (The linear expansion coefficients for steel and aluminum are 1.3 10-5 °C−1 and 2.2 10-5 °C−1, respectively. Enter your answer to three significant figures.)

I know the equation to be used is, delta length=(linear coefficient of expansion)(length)(delta temperature)

i am confused as to what to use for length on the right side of the equation, and what to subtract from delta length

• physics -

Hmmm. Do it in two parts, steel expansion, and aluminum expansion, then add the two expansions.

• physics -

What do i use for delta length?

• physics -

That is what you are solving for.

deltaLengthAl= coeff*changetemp*lengthorigAl
deltaLengFe= coeff*changetemp*lenghorigFe

Total changelenght= sum of above

• physics -

it didn't give me the correct answer

## Similar Questions

1. ### physics

If an observer is traveling parallel to a rod at twice the speed of the rod, what is does the observer perceive the length to be?
2. ### physics

If an observer is traveling parallel to a rod at twice the speed of the rod, what is does the observer perceive the length to be?
3. ### College Physics

A rod of mass 4.3 kg and length 4.3 m hangs from a hinge as shown in Figure P9.28. The end of the rod is then given a “kick” so that it is moving at a speed of 2.3 m/s. How high will the rod swing?
4. ### physics

A steel rod of length 1 m is welded to the end of an aluminum rod of length 2 m (lengths measured at 23 °C). The combination rod is then heated to 198 °C. What is the length of the combination rod at 198 °C?
5. ### physics

If a rod is moving at a velocity equal to 1/2 the speed of light parallel to its length, what will a stationary observer observe about its length?
6. ### Physics

The length of the rod will become exactly half of its original value. The length of the rod remains the same. The length of the rod will decrease. The length of the rod will increase. Wouldn't the length double, thus being answer D?
7. ### Physics

If a rod is moving at a velocity equal to 1/2 the speed of light parallel to its length, what will a stationary observer observe about its length?
8. ### Physics

The length of the rod will become exactly half of its original value. The length of the rod remains the same. The length of the rod will decrease. The length of the rod will increase. Wouldn't the length double, thus being answer D?
9. ### Physics

The length of the rod will become exactly half of its original value. The length of the rod remains the same. The length of the rod will decrease. The length of the rod will increase. Wouldn't the length double, thus being answer D?
10. ### science

A steel rod of length 60 cm and radius 2.5 mm hangs vertically. If a mass of 2.5 kg is attached to the end of the rod, calculate the increase in the length of the rod

More Similar Questions