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1. ### Isn t centripetal force equal to mv^2 over r ?

It's mv^2/ r . Here is how you can stop doubting: That formula...projection of the whole force on the plane perpendicular to the trajectory) provided " r " is understood to be the "radius of curvature" of the...

1 Answers · Science & Mathematics · 12/08/2008

2. ### how does U = mgh when h is smaller then r ?

g = GM/ r ^2 is the gravity field, as in PE = mgh, where R - r >= h is the height above r , the radius of the source mass M (e.g., Earth). R is the radius struck from the center of the source mass to the location...

4 Answers · Science & Mathematics · 18/12/2012

3. ### p=density, Q=total charge r =radial distance ; p( r )= Q/((4*pi* R ))*((e^- r / R )/ r ^2)?

p( r ) gives you the charge per unit volume of the region. To find the charge... charge in the region = charge per unit volume x volume So dq = p( r ) x dV where dV is the volume of the thin shell. (Note...

2 Answers · Science & Mathematics · 26/05/2011

4. ### given point r =[0 0 -3] and v=[0 2 1]. rotate r around v by 180 degree anticlockwise. find image r ?

If r is rotated about v, then the...same. So the approach is to express r in terms of v and also the coordinate... check that I can recover the original r r = r _v . i_v * i + r _v . j_v * j + r _v...

1 Answers · Science & Mathematics · 28/12/2013

5. ### the potential energy between two idential point like objects of the same mass,mi is given by the relation U( r )=mA[(r0/ r )^12-2(ro/ r )^6]?

U( r ) = mA[(r0/ r )^12 - 2(r0/ r )^6] (i) units of A must be m²... is in Joules. (ii) dU/dr = 0 = mA[-12*r0^12 / r ^13 + 2*6*r0^6 / r ^7] and this is zero where 12*r0^12 / r ^13 = 12*r0^6 / r ...

2 Answers · Science & Mathematics · 07/12/2016

6. ### how can I calculate the uncertainty in Resistance ( R )?

R = V/I First calculate the relative uncertainty in V, subtract the relative uncertainty in I from that. Thus you obtain the relative uncertainty in R . Using R you can then calculate the absolute uncertainty. Example...

1 Answers · Science & Mathematics · 28/06/2012

7. ### An uncharged capacitor of capacitance C is connected to a battery through a resistance R . Show that by the?

Assume that R and C are connected in series to a cell of...differential equation, by first dividing the equation by R and then multiplying the equation with the integration factor e...

1 Answers · Science & Mathematics · 04/07/2010

8. ### why v=w* r is correct equation explain with diagrame?

Hello Zeeshan, v = r w as we consider only the magnitudes. As we write in... at the centre Hence ds = r d@ Now divide both sides by dt So ds...

4 Answers · Science & Mathematics · 14/11/2012

9. ### What is the value of resistor R ?

R and the 200 ohm resistors are in parallel so the voltage across both of...same Voltage across 200 ohm resistor = 200*1.5 = 300V current through R resistor = 2.5 - 1.5 = 1 Ampere Voltage through R resistor = 300...

4 Answers · Science & Mathematics · 15/02/2012

10. ### Find curvature of r (t)?

The curvature for a parametrically defined curve r (t) = x(t)∙i + y(t)∙j + z(t)∙k is given...problem r (t) = 3∙t∙i + 4∙sin(t)∙j + 4∙cos(t)∙k => r '(t) = 3∙i + 4∙cos(t)∙j - 4∙sin(t)∙k r ''...

1 Answers · Science & Mathematics · 12/06/2013