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

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

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

Cold objects do not radiate heat energy.

When the Celsius temperature doubles, the Fahrenheit temperature doubles.

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

is it true, true, false, false, true, true? Concept questions confuse me too

true, true, true, false, false, false

thank you so much!!!!

Let's go through each statement one by one:

1. A copper plate has a hole cut in its center. When the plate is heated, the hole gets smaller.
- True. When the copper plate is heated, the metal expands. Since the hole is part of the plate, it will also expand and therefore get smaller.

2. When heat is added to a system, the temperature must rise.
- True. Heat is a form of energy, and when it is added to a system, it increases the kinetic energy of the particles in that system, leading to a rise in temperature.

3. When the pendulum of a grandfather clock is heated, the clock runs more slowly.
- False. Typically, heating the pendulum of a grandfather clock would cause the metal to expand, therefore making the pendulum swing faster and causing the clock to run faster.

4. Cold objects do not radiate heat energy.
- False. All objects above absolute zero temperature (which is -273.15 degrees Celsius) radiate some amount of heat energy, even if they are cold relative to their surroundings.

5. When the Celsius temperature doubles, the Fahrenheit temperature doubles.
- False. The Fahrenheit and Celsius scales have different intervals and zero points. Doubling a Celsius temperature will not result in the same value on the Fahrenheit scale.

6. In a bimetallic strip of aluminum and brass which curls when heated, the aluminum is on the inside of the curve.
- True. Bimetallic strips are made of two different metals with different coefficients of thermal expansion. When heated, the metal with the higher coefficient of expansion (in this case, aluminum) will expand more and cause the strip to curl with the aluminum on the inside of the curve.

So, the correct summary is: True, True, False, False, False, True.

Let's go through each statement one by one and see if they are true or false:

1. A copper plate has a hole cut in its center. When the plate is heated, the hole gets smaller.
- This statement is true. When the copper plate is heated, it expands uniformly, causing the hole to contract or get smaller.

2. When heat is added to a system, the temperature must rise.
- This statement is true. Heat is a form of energy, and when it is added to a system, it causes the particles in the system to gain energy and move faster, hence increasing the temperature.

3. When the pendulum of a grandfather clock is heated, the clock runs more slowly.
- This statement is false. When the pendulum of a grandfather clock is heated, it expands, causing the clock's timekeeping to speed up because the length of the pendulum increases. A longer pendulum swings slower, so heating the pendulum would make the clock run faster.

4. Cold objects do not radiate heat energy.
- This statement is false. All objects, regardless of their temperature, radiate heat energy continuously. The rate of heat radiation may vary depending on the temperature of the object, but even cold objects emit some heat energy.

5. When the Celsius temperature doubles, the Fahrenheit temperature doubles.
- This statement is false. The Celsius and Fahrenheit temperature scales are different, and temperature values on each scale do not correspond to each other in a simple linear relationship. Doubling the Celsius temperature does not result in doubling the Fahrenheit temperature.

6. In a bimetallic strip of aluminum and brass which curls when heated, the aluminum is on the inside of the curve.
- This statement is true. In a bimetallic strip, two different metals with different coefficients of thermal expansion are bonded together. When heated, the metals expand at different rates, causing the strip to bend or curl. The metal with the higher coefficient of thermal expansion will be on the inside of the curve, and in this case, aluminum typically has a higher coefficient than brass.

Understanding concepts can be challenging, but breaking down each statement and understanding the underlying principles helps in gaining knowledge. If you have any further questions or need more clarification, feel free to ask!