Question

Can you help me check some science questions
1. What is true for two pieces of iron at the same temperature?---------->
a. The average kinetic energy of their particles is the same.
b. The total kinetic energy of their particles is equal.
c. Heat flows from the larger object to the smaller object.
d. Heat 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?
a. The particles move closer together.
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b. The particles move faster.
c. The number of particles increases.
d. The 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?
a. The potential energy increases, and the lid contracts.
b. The potential energy decreases, and the lid expands.
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c. The temperature increases, and the lid expands.
d. The temperature decreases, and the lid contracts.

Answer 1

1 is a 2 b 3 c hope this helped

Answer 2

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".