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1. ### can someone please prove centrepital acceleration= V^2 / r?

My proof requires calculus. Consider any point (r cos wt, r sin wt) on a circle with center (0,0) and radius r and rotational...2 wt] = sqrt[r^2 w^2] = rw^2, since cos^2 wt + sin^2 wt = 1. rw^2 = r(v/r)^2 = v^2 / r.

3 Answers · Science & Mathematics · 02/04/2008

2. ### The centripetal force acting on a particle is given by F = mv2/r.?

... increases. The only way for F to remain constant when r decreases is if v decreases as well. F will become...

3 Answers · Science & Mathematics · 10/03/2011

3. ### RLC circuit. Calculate RMS voltage drop across R, L, and C?

... see if I can help you out. Given: R = 300 ohm L = 0.03 H C = 5*10^-6 ...'ll let you do the rest: a.) V = I R b.) V = I XL c.) V = I...

4 Answers · Science & Mathematics · 01/05/2012

4. ### what volume of oxygen at R.T.P is required .....?

... volume can be found using ideal gas law p∙V = n∙R∙T => V = n∙R∙T/p At room temperature and...

2 Answers · Science & Mathematics · 04/09/2010

5. ### Force F = (-9.0 N)i + (5.0 N)j acts on a particle with position vector r = (-1.0 m)i + (2.0 m)j?

Torque is defined a r x F. Since both vectors are in the same plane (i-hat...| = |r||F|sin(theta) where theta is the angle formed between r and F. Weird that it asks the torque before the angle, but whatever...

1 Answers · Science & Mathematics · 16/06/2012

6. ### What is the value of the unknown resistor R?

R = V / I R = 94 / 17.4 = 5.4023 Ω R =4 ...

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

7. ### 5 identical bulbs with equal resistance R in a circuit, can you explain why the answers are right?

... equivalent resistance of A and B is R’ = R*R/( R+R) = R/2... 2R and this is in parallel with R. Equivalent resistance is 2R*R...

4 Answers · Science & Mathematics · 30/08/2012

8. ### How to get the value of Rydberg's constant (R) and n_2?

1/λ = R (1/n₂² - 1/n₁²) 1/λ = R/n₂² - R(1.... 1/λ and 1/n₁² are variable quantities R and 1/n₂² are constants. Compare equation 1 to...

1 Answers · Science & Mathematics · 21/08/2013

9. ### What is the radius(r)of the path for a singly charged ion?

r = (m × E) / (q × B²) where r = radius = ? m = mass of the ion = 2.79E-26 kg E = electric field = 2800...

1 Answers · Science & Mathematics · 29/10/2012

10. ### Suppose that you wish to fabricate a uniform wire out of 1.05 g of copper. Assume the wire has a resistance R?

Is that R = 0.300Ω ? Resistance of a wire in Ω R = ρ... A is cross-sectional area in m² A = πr², r is radius of wire in m resistivity Cu 17.2e-9 Ω-m (17.2e...

1 Answers · Science & Mathematics · 27/02/2011