Recent content by Roaku

I give up. Don't get it. Good luck to the rest!

Okay, so I'm meant to use the equation twice. In that case, f obs (police) = fs (( vw + vobs) / (vw + vs ) ) I keep fs = 4.3kHz and as both sources are still going towards each other (+) vw = 340 m/s V obs (detector) = v = fλ = 4,300 * 0.044 = 189.2 km/h (?) (52.56 m/s) Vs = 64...

What do you mean? I don't understand. Vs is the source, and the ambulance is the source of the siren sound. It is traveling towards the observer which is the police car (with the radar detector of λ wavelength)... If the ambulance isn't the source, then what is? The police car? Then...

Doppler Shift/ Doppler effect! HELP 1. A police car is traveling at a constant speed of 110. km/h with a radar gun which generates and detects radiowaves. The police car and the ambulance drive directly towards each other. The radar gun produces radiowaves with a wavelength of 0.0440 m. An...

Homework Statement Homework Equations I believe: F = m . a Ffriction = μs . N Ffriction = μs . mg . cosθ The Attempt at a Solution I don't quite get how the equations above would give me an answer to the minimum friction required so that the farmer doesn't slip. I know Fl =...