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Imagine a box sliding down a rough slope. What will the free body diagram for the box look like?

In a free body diagram for a box on a rough slope, there will be three arrows. One will point out of the box up the slope (parallel to the slope), one will point directly downwards from the box, and the fina...
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Answered by Eve T. • Physics tutor
5826 Views

Why are values of gravitational potential negative?

One way of defining potential is:The GPE per unit massWe define an infinite distance from the centre of our field to have zero potential, this means that energy needs to be provided to an object for it to re...
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Answered by Harry T. • Physics tutor
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If you have 1.33g of oxygen (Mr = 32) in a container of volume 1000cm^3 at atmospheric pressure (101.3*10^3 Pa), what is the temperature of the gas in Celsius? R=8.314

T=20.2 degrees Celsius. Start by finding number of moles using n=mass/Mr so n=1.33/32=0.0416. Find the volume in m^3 using 1cm^3=1 10^-6 m^3 giving V=1 10^-3 m^3 then rearrange PV=nRT to get T=PV/nR so T=(10...
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Answered by Ethan T. • Physics tutor
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If Jessica weighs 45kg and sits on a seesaw at a distance of 2m from the centre of the seesaw.Micheal weighs 90kg. At what point on the opposite side should Micheal sit in order to balance the seesaw.

Micheal should sit at a distance of 1m from the pivot or half whatever distance Jessica sits. This is found intuitively here but can be found with any two masses by resolving moments.
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Answered by Hugh P. • Physics tutor
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A car is travelling at 10m/s. It then accelerates at a constant rate.Find the time taken for the car to travel 1km if the car’s final velocity is then 22m/s .

s=((u+v)/2)t1000=((10+22)/2)t1000=(16)tt= 62.5s
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Answered by Mark W. • Physics tutor
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