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1. ### A torsion pendulum is made from a disk of mass m = 7.1 kg and radius R = 0.76 m. A force of F = 41.2 N exerted?

...m = 7.1kg /*mass of disk to be torqued*/ R = 0.76m /*radius of disk*/ F = 41.2N... given by: (6) I = (1/2)* m * R^2 /*for a solid disk of radius R, see ref 2...

5 Answers · Science & Mathematics · 24/04/2011

2. ### select the divergence of r/r^3 where r=magnitude of r and r =x i+y j+z k?

the magnitude of vector R is (x^2+y^2+z^2)^1/2, so, I will use R to indicate the position..., I will use the notation ()^3/2 to mean (x^2+y^2+z^2)^3/2 div (R/r^3)=d/dx[x/()^3/2] + d/dy[y/()^3/2] +d/dz[z/()^3/2] If you differentiate...

1 Answers · Science & Mathematics · 17/10/2010

3. ### 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

4. ### 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

5. ### 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

6. ### Does anyone know what R stands for in the equation f=μR?

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

7. ### 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

8. ### 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

9. ### 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

10. ### 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