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A balloon's volume is 0.002m^3 at room temperature (20°C). What volume will the balloon occupy when it is cooled to -5°C? Give your answer to 3 significant figures.

(Charles' Law) V₁/T₁ = V₂/T₂ (Rearrange) V₂ = (V ₁T₂)/T₁ (What are all the values in the equation?) V₁ = 0.002m^3 T₁ = 20°C T₂= -5°C V₂= ?? (Convert all temperature values into Kelvin) T₁ = 20+273 = 293K T₂=...
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Answered by Ellen W. • Physics tutor
1890 Views

A student is investigating how the pressure exerted by a gas varied with the volume of the gas. The initial pressure was 1.6x10^5 Pa, with the volume being 9.0cm^3. Calculate the volume of the gas when the pressure was 1.8x10^5 Pa

pxV=constant (1.6x10^5) x (9.0) = (1.44 x 10^6) p= (1.44 x 10^6)/(1.8 x 10^5) = 8 cm^3
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Answered by Arianna C. • Physics tutor
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What is a chain reaction?

When neutrons from one reaction fire off to cause further reactions.
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Answered by Molly F. • Physics tutor
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A mass of 2.5kg is raised by a height of 8m in 36 seconds using an electronic motor. Calculate the power of the motor.

Power = Work / Time. Work = mgh = 2.5 9.81 8 = 196.2 J. Power = 196.2 (J) / 36 (Seconds) = 5.45 W.
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Answered by Michael V. • Physics tutor
1817 Views

How much thermal energy does a 1 kg steel block with a specific heat capacity of 450 J/kg°C lose when it cools from 400°C to 60°C?

E=mc 0 E = 1 x 450 x (400-60)E = 1 x450 x 340E = 153,000J
MH
Answered by Maisy H. • Physics tutor
3582 Views