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Troyanec [42]
3 years ago
8

A 100.0 lb skier moves at 40.00miles/hour. Calc her kinetic energy.

Chemistry
1 answer:
Pepsi [2]3 years ago
5 0

answer: its 7290 joules.

explanations: the first procedure is to convert 1 pound to kilogram. 1 kg = 2.205 hence given 100 lb so we cross multiply. 1 kg * 100 = 2.205 * x

hence x= 45 kg. let's convert 1 mile per hour = 0.45 metre per second we cross multiply by 40 mile per hour. x= 40 * 0.45= 18 m/s.

KE= 1/2 * 45 * (18)^2

= 1/2 * 45 * 14580

= 7290joules

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2 years ago
An unknown gas effuses at one half the speed of oxygen. What is the molar mass of the unknown? It is either HBr or HI. Which gas
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Rate of effusion ∝ 1/√molar mass.

  • <em>(Rate of effusion of O₂) / (Rate of effusion of unknown gas) = (√molar mass of unknown gas) / (√molar mass of O₂).</em>
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( √molar mass of unknown gas) = 2.0 x √32.0

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<em>So, the unknown gas is HI.</em>

<em></em>

5 0
3 years ago
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