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schepotkina [342]
3 years ago
13

21. True or false: During heat transfer heat always travels from the warmer object to the cooler object.

Physics
1 answer:
guajiro [1.7K]3 years ago
4 0
Answer: True

When 2 things are at different temperatures and they touch eachother, the heat flows from the warmer object to the cooler one.


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Newtons first law states that:

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5 0
2 years ago
A ball with a mass of 5000 g is floating on the surface of a pool of water.
Vitek1552 [10]

Answer:

d

Explanation:

reply the the question

8 0
3 years ago
6) If a mass of an object is decreased to half and acting force is reduced by quarter the acceleration of its motion
Zepler [3.9K]

Answer:

Decreases to half.

Explanation:

From the question given above, the following data were obtained:

Initial mass (m₁) = m

Initial force (F₁) = F

Initial acceleration (a₁) =?

Final mass (m₂) = ½m

Final force (F₂) = ¼F

Final acceleration (a₂) =?

Next, we shall determine a₁. This can be obtained as follow:

F₁ = m₁a₁

F = ma₁

Divide both side by m

a₁ = F / m

Next, we shall determine a₂.

F₂ = m₂a₂

¼F = ½ma₂

2F = 4ma₂

Divide both side by 4m

a₂ = 2F / 4m

a₂ = F / 2m

Finally, we shall determine the ratio of a₂ to a₁. This can be obtained as follow:

a₁ = F / m

a₂ = F / 2m

a₂ : a₁ = a₂ / a₁

a₂ / a₁ = F/2m ÷ F/m

a₂ / a₁ = F/2m × m/F

a₂ / a₁ = ½

Cross multiply

a₂ = ½a₁

From the illustrations made above, the acceleration of the car will decrease to half the original acceleration

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Perpendicular means at 90 degree angle. so,
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