Solve exercises on pages 58 and 59 of the 6th-grade Physics textbook: Thermal Expansion of Solids

Solve exercises on pages 58 and 59 of the 6th-grade Physics textbook: Thermal Expansion of Solids
 

Question 1. Why, when heated, does the sphere not pass through the metal ring?

Solution Guide:

Because the sphere expands when heated.
 

Question 2. Why does the sphere pass through the metal ring after being immersed in cold water?

Solution Guide:

Because the sphere contracts when it gets colder

Question 3. Choose appropriate words from the given list to fill in the blanks of the following sentences:

a) The volume of the sphere increases when the sphere (1)......
b) The volume of the sphere decreases when the sphere (2)..........
Words to fill in:
- Heats up
- Cools down
- Increases
- Decreases

Solution Guide:

(1) Increases
(1) Cools down
 

Question 4. What observations can be made about the thermal expansion of different solids from the given table?

Solution Guide:

Different solids expand to varying degrees due to heat. Aluminum expands the most, followed by copper and then iron.

Question 5.

At the handle (haft) of a knife or wood chisel, there is often a metal ring called a stitch, used to tightly secure the blade. Why must the blacksmith heat the stitch before fitting it into the handle?

Solution Guide: The stitch of the knife or chisel must be heated because when heated, it expands to fit into the handle. When it cools down, the stitch contracts tightly into the handle.

Question 6: Think of a way to make the sphere in the experiment in Figure 18.1 of the textbook, even when hot, can still pass through the metal ring. Perform an experiment to verify.

Solution Guide: Heat the metal ring

Question 7. Answer the question posed at the beginning of the lesson. Knowing that in France, January is winter, and July is summer

Solution Guide: In summer, the increased temperature causes the steel to expand, making the tower taller