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3 years ago

Can you help me check some science questions

Physics

2 answers:

UkoKoshka [18]3 years ago

8 0

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".

xeze [42]3 years ago

7 0

1 is a 2 b 3 c hope this helped

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3 years ago

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4 years ago

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2 years ago

What is the magnitude of the acceleration of a speck of clay on the edge of a potter's wheel turning at 45 rpm (revolutions per

Brilliant_brown [7]

Answer:

$a_{cp}=7.77m/s^2$

Explanation:

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We know the wheel turns at 45 rpm, which means 0.75 revolutions per second (dividing by 60), so our frequency is f=0.75Hz, which is the inverse of the period T.

Our velocity is the relation between the distance traveled and the time taken, so is the relation between the circumference $C=2\pi r$ and the period T, then we have: