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1. ### 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

2. ### 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

3. ### need help?

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

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

4. ### 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

5. ### 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

6. ### What is the speed of the satellite traveling in orbit 2 radii above the surface of the earth?

V = √(GM/R) V = √( (6.673e-11)(5.97e24) / (3• 6.37e6) ) = ______ m/s Satellite...6.673e-11 Nm²/kg² M is mass of central body in kg R is radius of orbit in m earth radius 6,371 km = 6.37e6 meters earth...

2 Answers · Science & Mathematics · 08/05/2019

7. ### For any patch element on the G-cylinder’s curved surface, what is the angle θ?

dA^ = r^ dh dφ E = k q r^ / r³ then the angle θ between the electric field vector E^ and the vector dA^ is null

1 Answers · Science & Mathematics · 12/09/2019

8. ### Physics: Circular motion and gravitation question?

Vorb^2/R = Ms*G/R^2 Vorb^2*4.75*10^10 = 8.05*10^29*6.67*10...

1 Answers · Science & Mathematics · 01/06/2019

9. ### Consider a particle of mass m = 18.0 kg revolving around an axis with angular speed ω.?

tangential velocity Vt = ω*r = 23*1.75 m/sec Ke = m/2*V^2 = 18/2*(23*1.75)^2 = 14,581 joule or J = m*r^2 = 18*49/16 KE = J/2*ω^2 = 9*49/16*23^2 = 14,581 joule

1 Answers · Science & Mathematics · 17/10/2019

10. ### I would really really really appreciate any help!! You don't need to show all the work, an equation can even help!!?

Ipeak = Vr/R = 60/300 = 0,20 A Vℓ = X*I = ω*L*I = 200...

2 Answers · Science & Mathematics · 06/08/2019