Recent content by Xiao10

Situation: A uniform cylinder (Mass M, Radius R) is rotating down a slope of incline θ and distance s, there are two methods which I used to calculate the final speed, one of which considered forces acting on the cylinder and the other using energy, pure rolling assumed throughout, both give...

Thank you, I may well try that with a foot pump.

Thank you for your reply, 1m is indeed the depth given. How would you estimate the maximum force that the lungs can exert? 100lbs comes to around the weight of a light person - so would you go from the fact that you wouldn't be able to breathe with someone sitting on your chest?

dx=vdt, so dt=dx/v, integrate to find time

Came across this question in the Flying Circus of Physics, My initial assumption was that this would be where the water pressure becomes greater than the maximum pressure difference that can be created between the lungs and atmospheric pressure. a search revealed the normal pressure...

Fairly sure it means gram.

You know both the force applied to the spring from the hanging mass as well as the extension.

Wouldn't a steel washer remain magnetised after the current is switched off?

Thanks, that makes sense, will try the experiment again if time and equipment allowsl

Hi, In class we were discussing the effects of a two bar magnets being dropped through a copper tube at around the same time, with the same pole facing towards each other, so that the two magnets repel - would the magnets fall through the tube faster or slower than if only one was dropped...