# True/False:Heat System

1. Nov 14, 2007

### sheri1987

1. The problem statement, all variables and given/known data

When the pendulum of a grandfather clock is heated, the clock runs more slowly. FALSE

Cold objects do not radiate heat energy. TRUE

In a bimetallic strip of brass and copper which curls when heated, the brass is on the inside of the curve. TRUE

A copper plate has a hole cut in its center. When the plate is heated, the hole gets smaller. FALSE

When the Celsius temperature doubles, the Fahrenheit temperature doubles. FALSE

When heat is added to a system, the temperature must rise. FALSE

2. Relevant equations

3. The attempt at a solution

I thought the answer was false, true, true, false, false, false...but it isn't right. Any suggestions?

2. Nov 14, 2007

### mgb_phys

A longer pendulum takes longer to swing. Imagine how long a 100m cable hanging from a crane takes compared to a clock pendulum.

Objects at absolute zero don't emit heat. How cold does cold mean?

Expansivity Copper 16.5 (m/m.K x 10-6) Brass 18.7 (m/m.K x 10-6)
Which one expands more, which side of a curve gets longer?

Do metals expand or contract when heated?

Correct - Celcius and Fahrenheit don't have the same zero point.

If it is an isolated system so that heat can't escape.
Temperature is a measure of the average energy of the molecules, so if heat is added what happens to the energy?

Last edited: Nov 14, 2007