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1. ### EP = -GMm/r?

When we define PE --> 0 as r --> r, such as when calculating escape velocity from a planet with mass ... = GMm/r, the stored energy gets smaller as r --> infinity. And that's just not the physics of energy is...

2 Answers · Science & Mathematics · 16/08/2014

2. ### A solid cylinder of mass M = 1.71 kg and radius R = 7.9 cm pivots on a thin, fixed, frictionless bearing (see?

Torque τ = F*R= Iα where I =MR^2/2 and α is the angualar accceleration...and exerts a torque on M giving an angualar accceleration α. a = R α For the mass M, F = I α/R = [MR...

1 Answers · Science & Mathematics · 05/07/2010

3. ### Unit vectors: r(hat) = r/|r|?

|r| = sqrt(5^2 + 10^2) = sqrt(125) = 5 * sqrt(5) r(hat) = (5.00 / (5 * sqrt(5))) i(hat) + (-10.00 / (5 * sqrt(5))) j(hat) r(hat) = (1.00...

2 Answers · Science & Mathematics · 07/10/2010

4. ### If R = 2.400 ± 0.003, what is the relative uncertainty for R−2? Plz also provide explanation/solution.?

...you could THEN turn into a fraction. ie ( 2.4 + 0.003)^(-2) < R^(-2) < (2.4 - 0.003)^(-2) 0.173178 < R ^(-2...

4 Answers · Science & Mathematics · 08/09/2019

5. ### How do you find the relative uncertainty of R^-2, the absolute uncertainty of R^-2 and the relative uncertainty of √R?

...absolute (same uncertainty units as the R² & √R values) why not just use the max and min values...56) x 100% = +/- 0.173% ANS repeat same method for √R {the answer can be no more significant than the R value

1 Answers · Science & Mathematics · 08/09/2017

6. ### Why is gravitational energy negative in this formula??Eg = -(MmG)/r?

... (1/infinity - 1/R1) = = GMm (0 - 1/R1) = -GMm/R Convenient formula, is not it? In this case the energy ...

3 Answers · Science & Mathematics · 23/04/2008

7. ### Ammeter reading =4 amps Voltmeter reading=4 volts (given) but please show how they got that.e=26 volts and R=3 ohms?

...you re-draw this ckt you have 6Ω in parallel with R in parallel with E +1Ω in parallel with 3... because the current MUST be down into the R for KVL to be satisfied. Remember...

1 Answers · Science & Mathematics · 08/10/2016

8. ### A 2.8 µC is at x = 0 and a -2.0 µC charge is at x = 3.5 cm. Let V = 0 at r = ∞.?

... unlikely so try to the right of the 2µC first. Let r be the distance right of the 2µC 2.8/(r+0.035)² = 2/r²...

2 Answers · Science & Mathematics · 25/05/2017

9. ### A solid non-conducting sphere of radius R carries a non-uniform charge distribution with charge density?

a) The charge per unit volume is ρ=ρ1 (r/R) where r is the distance from the center. Divide the entire... = π(ρ1)(R^3) b) Let the electric field at a distance r from the center be E. Consider a Gaussian Surface...

2 Answers · Science & Mathematics · 14/04/2009

10. ### Find the volume of the solid based on the interior of the circle r = cos θ, and capped by the plane z=x?

... by the solid) dV = = ∫[from θ=-π/2 to π/2] dθ ∫[from r=0 to cos(θ)] r dr ∫[from z=0 to r cos(θ)] dz = = π/8 2. This ...

1 Answers · Science & Mathematics · 16/06/2010