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1. ### Show that the charge density must vary with distance from the center according to p = 2Eε0/ r ?

... and assume that E only has a radial component to get; (1/ r ^2)d( r ^2E)/dr = D/eo Expand the derivative (1/ r ^2)[2rE...

1 Answers · Science & Mathematics · 02/09/2011

2. ### Suppose an object follows the trajectory R (t) = <2t^3, -t^3, 5t^3> for 0 <= t <= 4. Find the speed and length of its trajectory.?

R (t) = < 2t^3, -t^3, 5t^3> for 0 ≤ t ≤ 4 velocity = R '(t) = < 6t², -3t², 15t² > speed...

1 Answers · Science & Mathematics · 26/02/2016

3. ### Sphere, of radius R , density ró, falls down in liquid...?

..., the viscous friction is F = 6 π η R v The force of buoyancy is 4/3 π ρ g R ... R ^2) v with solution ( v(0) = 0 ) v(t) = 2Δρ g R ^2 / (9 η) ( 1 - exp(-9 η/(2 g Δρ R ^2...

1 Answers · Science & Mathematics · 09/01/2013

4. ### Does anyone know what R stands for in the equation f=μ R ?

R is the normal force. Suppose a block is on the table. it ..." ..... I don't know why in ur book it is called R

6 Answers · Science & Mathematics · 01/11/2007

5. ### find the first and second derivatives r =(1/4s^3)-(65s^4)?

r =(1/4 s^3) - (65 s^4) r ' = (3/4 s^2) - (260 s^3) r '' = (3/2 s) - (780 s^2)

2 Answers · Science & Mathematics · 06/11/2013

6. ### Three point charges lie along a circle of radius r at angles of 30°, 150°, and 270° as shown in the figure.?

... point charges lie along a circle of radius r at angles of 30°, 150°, and 270° as shown in... Electric field = (9 * 10^9 * q) ÷ r ^2 x-components: [(9 * 10^9 * q) ÷ r ^2] * cos 30...

1 Answers · Science & Mathematics · 09/09/2012

7. ### Physics: Transfer of heat by conduction w/ R factors.?

...? ------------------------------------------- In that case, since you have the R -values for these bulk construction methods, I will show you the...

1 Answers · Science & Mathematics · 15/05/2013

8. ### Consider the circuit in the figure below, in which V = 95 V and R = 4 .?

a) R & the 20 are in parallel so Req = 4*20/(4+20) = 3.333 So the equivalent series R is 3.333 + 2 + 4 = 9.33Ω Now i = V/ R = ...

1 Answers · Science & Mathematics · 06/06/2010

9. ### Resonance in an R -L-C Circuit?

..., circuit behaves as if the series circuit consisted on resistance R only. On the other hand, voltage across capacitor is given by...

3 Answers · Science & Mathematics · 29/06/2007

10. ### What is I5 and R equivalent or total R ?

(2) R2 & R4 are in series:- => R (24) = 6+3 = 9Ω R5 & R (24) in parallel... = 6.86 -------------(i) Now I5 x 3 = R (24) x I2 =>3I5 = 9I2 =>...

2 Answers · Science & Mathematics · 15/02/2013