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Can you help me check some science questions

  1. What is true for two pieces of iron at the same temperature?---------->
AThe average kinetic energy of their particles is the same.
BThe total kinetic energy of their particles is equal.
CHeat flows from the larger object to the smaller object.
DHeat flows from the object with higher potential energy to the object with lower potential energy.

2.What happens when the temperature of an object increases?

AThe particles move closer together.

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BThe particles move faster.
CThe number of particles increases.
DThe particles stop moving.

3.To remove a tight-fitting lid from a jar, Megan runs the lid under hot water. What happens to the jar lid when its temperature increases?

AThe potential energy increases, and the lid contracts.
BThe potential energy decreases, and the lid expands.

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CThe temperature increases, and the lid expands.
DThe temperature decreases, and the lid contracts.

Verified Answer :

curranms030238

1 is a 2 b 3 c hope this helped

Explanation:

(1) The average kinetic energy of a molecule is given by :

\(K=\dfrac{3}{2}kT\)

K is Boltzmann constant and T is temperature

So, when the two pieces of iron are at same temperature, the average kinetic energy of their particles is same.

(2) When the temperature of an object increases, the particles starts vibrating with much more speed. Hence, the correct option is (b) " The particles move faster ".

(3) To remove a tight-fitting lid from a jar, Megan runs the lid under hot water. When the temperature of the jar lid increases, the lid expands. This is because metals have tendency to expand when temperature increases.

Hence, the correct option is (c) " The temperature increases, and the lid expands".

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