Physics, 28.03.2021 14:00 jocelyntucker

Question one In an experiment to determine the speed of a sound, learners are given a siren that sounds a single note of
frequency 426Hz which is attached to a remote controlled car and moves it at a constant speed past a
stationary tape recorder which is mounted in the middle of a runaway. The learners observed that the pitch
of the sound from the siren as it moved towards the tape recorder was higher compare to when the siren
moved away
A. Name and define the effect which explain this observation
B. Mention three applications of the named effect
C. In one of the trials, the speed of the remote-controlled car was noted as 31km/hr, two notes from
the siren were recorded, one with a frequency of 437Hz and the other note with a frequency lower
than 426Hz. Determine the speed of sound in air

Answers: 2

Show answers

Another question on Physics

Physics, 23.06.2019 02:30

What are two examples of phase changes that skip a phase during transition?

Answers: 1

Answer

Physics, 23.06.2019 02:50

Orque can be calculated by multiplying the force (n) applied at 90∘ to the lever arm at a distance (m) from the pivot point (point of rotation), the compound si unit for the torque is n⋅m. if the force (at 90∘ to the lever arm) applied is 15 n and it is applied at 2.0 m from the pivot point (point of rotation), what is the torque on the lever?

Answers: 2

Answer

Physics, 23.06.2019 08:00

Which of the following is a false statement about dispersion forces? view available hint(s) which of the following is a false statement about dispersion forces? dispersion forces are the result of fluctuations in the electron distribution within molecules or atoms. dispersion forces are present in all atoms and molecules. dispersion forces result from the formation of instantaneous dipoles in a molecule or atom. dispersion forces always have a greater magnitude in molecules with a greater molar mass. dispersion force magnitude depends on the amount of surface area available for interactions.

Answers: 1

Answer

Physics, 23.06.2019 09:30

While strolling downtown on a saturday afternoon, you stumble across an old car show. as you are walking along an alley toward a main street, you glimpse a particularly stylish alpha romeo pass by. tall buildings on either side of the alley obscure your view, so you see the car only as it passes between the buildings. thinking back to your physics class, you realize that you can calculate the car's acceleration. you estimate the width of the alleyway between the two buildings to be 6 m. the car was in view for 0.6 s. you also heard the engine rev when the car started from a red light, so you know the alpha romeo started from rest 4 s before you first saw it. find the magnitude of its acceleration.

Answers: 1

Answer

You know the right answer?

Question one In an experiment to determine the speed of a sound, learners are given a siren that so...

Questions