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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