Recent content by al_201314

Thanks for the replies guys. Part 1's going good for me except for the portion after integrating, why is there a +qnot in the equation? For part 2, I still cannot fully get it. Here's what I have after reading the posts and some thinking through. 0.5A = Acos(2pit/T). The A cancels out on...

Hi guys, I'm stuck at this 2 questions for a while. :confused: 1. A mass suspended from a vertical spring is displaced vertically downwards by a distance A and released. It executes simple harmonic motion about its equilibrium position O. Given that time taken for the mass to move through...

Sorry for the mistake. And I just managed to solve it. Sorry for the trouble and your tip on the mass helped. Thanks!

Allow me to ask another one I couldn't really get the answer as well. Earth has a radius R and value of acceleration of free fall at its surface is g. A planet in another system has same average density as Earth but free fall at its surface is 3g/2. Whats the radius of this planet? g =...

Ahh thanks guys I got the answer in just one step. It is basically just the equation for the escape velocity. I guess all my wrong interpretations lead me to think otherwise and I can't believe at my level I got the GPE equation wrong! Thanks anyway!

Since it is stationary relative to the earth, wouldn't it be orbiting just like a geostationary satellite in orbit? The potential is 0 at infinity? Anyway the given answer is 1.1 x 10^4 ms^-1

The total energy the rock has is -GMm/r^2 during the orbit where r is radius of orbit am I right? So when it drops straight all these energy will be converted to KE of the rock? So -GMm/r^2 - GMm/(6.4 x 10^6)^2 = 1/2mv^2? However I still can't solve from here as mass of Earth is not given as...

Hi guys I need help with this after quite some time A piece of rock far out in space is relative to the earth. Under the influence of the Earth's gravitational attraction, it begins to fall towards the Earth along a straight adial line. With what speed will the rock hit the earth? (Given...

Thanks. But I suppose the question only wanted any interference? And I suppose 1365J is correct?

Thanks app. Anyone else have other inputs for the other questions?

More conceptual MCQs :) Hi guys, After the concept test that I found quite difficult for some.. apologise for asking so many questions at a go. I try my best to solve for all just hope that any of you would be kind enough to correct any wrongs. I always have the urge to know the correct...

Hi guys, First of all thanks for the replies. For question 1, I figured another way to approach the question. The work done moving the mass can be calculated using C.O.E. The vertical height moved is 2.5m by geometry and so (9.81)(30)(2.5) + (0.5)(30)(1^2) + 600 to give 1365J. Am I right...

Hi guys, I need some assistance on the following. 1) You need to push a 30kg mass up an inclined slope of 30 degrees from rest. After moving it by 5m and creating 600J of energy due friction in the process, you find that the mass is moving at 1 m/s. Find the work done moving the mass over...

Thanks Hootenanny for all the help. If anyone do have an alternative opinion for 4) do post! Thanks for any inputs!

3) I understand. 4) I got it after some reading up as well. Just to confirm the options I chose were correct? 5) How would one know whether there is a value for dQ, ie, if heat was supplied? Would they mention in the question in anyway or it is up for deduction? However, why is the...