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Questions on Circular Motion 
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#1
Sep906, 10:40 PM

P: 13

1. When the radius and mass are held constant, what do you expect to happen to the centripetal force if the frequency of rotation is increased?
2. What will happen if a rotating platform was set up slightly off the horizontal? Would anything change? What in particular? 3. A ball rotates in a horizontal circle at a constant speed of 10m/s. what are the tensions in the upper and lower strings? The mass of the ball is 3kg. 4. What angle of bank is necessary for a car to make it around a 130m curve at a speed of 60kph without relying on friction. 5. Determine the speed of the satellite orbiting at a height of 700km above the Earth's surface. mass of earth = 5.98 x 10^24 kg radius of earth = 6.38 x 10^6 m ~~~~~~~~~~~~~~~~~~~~~~~~ I would greatly appreciate the help... Oh, and btw, I also need Free Body Diagrams for problems 3  5 (so that i won't get confused ) Thanks again.... 


#2
Sep906, 10:52 PM

P: 494

asteg, what are your thoughts so far?
Especially about the free body diagramhave you come up with anything at all? 


#3
Sep906, 11:26 PM

P: 13

So far, I had only done number 4, but i am not very sure of what i did...
I had made a FBD of this and it showed a vector at a certain angle (WRT the yaxis) and towards the right... this vector represents the Normal force... there is also a vector downwards, and it is W=mg and from there, i'm stuck... With regards to the other problems, I always get stuck on the FBD, so I can't really figure the problem out... Hope you could help me... 


#4
Sep1006, 01:43 AM

P: 13

Questions on Circular Motion
Ok, so far, I had answers to number 3 & 4, However, I'm not sure if they're right...
Here's what i did, on number 3, I made an FBD and here it is... Can anyone verify this.... This is my equation Letting the angle be A the Summation Fy=0=T'sinA  T''sinAw the summation Fx=m*a=(mv^2)/R=T''cosA+T'cosA then i simply did algebra and got the answer T'' = 325.62N and T' = 360.9N ~~~ In need of verification ~~~ and for number 4 where the angle is A i got the summation Fx=m*a=n*sinA where a is arad and summation Fy=0=n*cosAm*g I have yet to solve this, and i had noticed the lot of conversion of units in this problem However, i still need to verify if what I did was correct... ~~ in need of verification ~~ and with regards to 1, 2 and 5 , I still have no answers... especially in the numbers 1 & 2 (I'm bad at theory) Anyways... hopefully, someone will provide help.... Thanks in advance... 


#5
Sep1006, 04:17 AM

HW Helper
P: 3,220




#6
Sep1006, 05:36 AM

P: 13

Is there any other way of solving this other than this method... coz we still haven't discussed GM yet... I think the method is somewhat involving frequency.. I'm not really sure... 


#7
Sep1006, 05:51 AM

P: 389

well i'm not very sure it Frequency can be used here, but what is the point of giving u the mass of the earth if Gravitational Force will not be used.



#8
Sep1006, 06:10 AM

P: 13

hmm... true...
I guess I will use the Gravitational force... THANKS!!! 


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