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1. I'm unsure what to do about this Coulomb's Law problem. Help?

a) The force on q1 due to q3 (r=10cm = 0.1m) is: F13 = k.q1.q3/r² = 9*10^9 * (-3*10^-6) * (3... = 0.1² + 0.1² = 0.02 The force on q1 due to q2 (with r=d so r² = d² = 0.02) is: F12 = k.q1.q1/r²...

1 Answers · Science & Mathematics · 22/06/2019

2. Physics equation manipulation question!?

Fg / r = GMm/r^3 Which is not particularly useful if you ask me, are you sure that's what you mean?

3 Answers · Science & Mathematics · 11/07/2019

3. What does the expression reduce to if we move so far away along the central axis that ?

For z >> R, E = qz / [4πε₀*(z²+R²)^(3/2)] ≈ qz / [4πε₀...

2 Answers · Science & Mathematics · 04/09/2019

4. Can someone solve this physics question?

R = 37.2^2/9.80*sin 28.2 = 141.2*0.4726 = 66.73 m

2 Answers · Science & Mathematics · 12/08/2019

5. What must be the resistance of the element?

P = V I = V^2 / R 3.4E3 = 240^2 / R R = 17 ohm to two sig figs When you get a good response, please consider giving a best answer. This is the only reward we get.

2 Answers · Science & Mathematics · 24/04/2019

6. Need help with physics problem?

... what you are to solve for is V of the battery and R of the battery. When the resistors are in parallel the effective...

6 Answers · Science & Mathematics · 27/02/2019

7. What is the wavelength of a photon that will excite an electron from n=3 to n=5 in a hydrogen atom?

change in energy = R(1/3² - 1/5²) = 1.55e-19 J and change in energy = hv / λ so λ = hv / change in energy = 6.626e−34J·s * 2.998e8m/s / 1.55e-19J λ = 1.282e-6 m = 1.282 µm = 1282 nm

2 Answers · Science & Mathematics · 14/06/2019

8. need help?

Power = V²/R = (1.5+1.5)²/10Ω = 0.9W <----- (a) 2/3 * 0...

1 Answers · Science & Mathematics · 09/06/2019

9. A top with radius 10cm, mass 2kg has a string around the edge and is initially at rest. . . .?

A/ torque τ = r x F = 0.10m * 10N = 1.0 N·m B/ For a solid cylinder...

1 Answers · Science & Mathematics · 12/06/2019

10. What is the current through the middle (7.8 Ω) resistor? Answer in units of A. Physics help?

first get total R as seen by the battery 1 in parallel with 7.8 is 7.8/8.8 = 0.886... which produces current thru 7.8 Ω of I = E/R = 0.094/7.8 = 0.012 amp or 12 mA

1 Answers · Science & Mathematics · 04/03/2019