Top answers

Physics
All levels

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...

Answered by Ellen W. Physics tutor
1124 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

Answered by Arianna C. Physics tutor
7664 Views

What is a chain reaction?

When neutrons from one reaction fire off to cause further reactions.

Answered by Molly F. Physics tutor
1191 Views

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 = 2.59.818 = 196.2 J. Power = 196.2 (J) / 36 (Seconds) = 5.45 W.

Answered by Michael V. Physics tutor
1128 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=mc0E = 1 x 450 x (400-60)E = 1 x450 x 340E = 153,000J

Answered by Maisy H. Physics tutor
2317 Views

We're here to help

contact us iconContact usWhatsapp logoMessage us on Whatsapptelephone icon+44 (0) 203 773 6020
Facebook logoInstagram logoLinkedIn logo
Cookie Preferences