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kiruha [24]
3 years ago
14

You travelled from Ras al Khaimah to Abu Dhabi by road in 3 hour. The distance between the two cities is 270 km, whereas the aer

ial (by air) distance is 210 km.
note: Aeroplane always flies in straight line.

Please choose one of these answers:

A) average velocity is 60 km/h
B) average velocity is 70 km/h
C) average velocity is 80 km/h
D) average velocity is 90 km/h
Physics
1 answer:
jeyben [28]3 years ago
4 0
Average velocity is 90km/h
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Heat needed = 71.19 J

Explanation:

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Mass of water, m = 31.5 g = 0.0315 kg

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Substituting

            H = mL = 0.0315 x 2260 = 71.19 kJ

Heat needed = 71.19 J

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The speed of the man and the chair after the book is thrown is 0.2 m/s.

The given parameters:

  • <em>mass of the book, m₁ = 2.1 kg</em>
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The speed of the man and the chair after the book is thrown is determined by applying the principle of conservation of linear momentum;

m_1 u_1 = m_2u_2\\\\u_2 = \frac{m_1u_1}{m_2} \\\\u_2 = \frac{2.1 \times 7.2}{79.2} \\\\u_2 = 0.2 \ m/s

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Learn more about conservation of linear momentum here: brainly.com/question/7538238

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