subject
Physics, 11.12.2020 08:10 poniatowski23

A train blows its whistle as it moves rapidly towards a stationary observer. Which of the following best describes the sound of the whistle as heard by the observer in comparison to the sound as heard by a passenger on the train?

ansver
Answers: 3

Other questions on the subject: Physics

image
Physics, 22.06.2019 07:20, hardwick744
If 2 moles of co_2 at 2l and 500k are expanded reversibly to 20l, more work can be obtained from an adiabatic process than from an isothermal process. is the above statement true or false?
Answers: 3
image
Physics, 22.06.2019 09:00, cameronbeaugh
Yvette hangs a 2.4kg bird feeder in the middle of a rope tied between two trees. the feeder creates a tension of 480 n in each side of the the rope.
Answers: 1
image
Physics, 22.06.2019 15:30, Christyy1837
What are the similarities & differences between a thermistor and a light dependent resistor in physics?
Answers: 2
image
Physics, 22.06.2019 22:00, lex1kkkk
The inside surface of a cylindrical-shaped cave of inner diameter 1.0 m is continuously covered with a very thin layer of water. the cave is very long and it is open on both ends. the water on the cave surface is at a constant temperature of 15.5 °c. the cave is constantly exposed to wind such that 15.5 °c air flows through the cave at 4.5 m/s. the kinematic viscosity of the air is 14.66 x 10-6 m2/s and the molecular diffusion coefficient of water vapor in the air is 0.239 x 10-4 m2/s. because the cave diameter is so large, the flow of wind down the length of the cave, in the x direction, can be treated like it is external flow and the cave surface can be approximated as flat where appropriate. calculate the x value, in a) the transition to turbulent flow occurs at rex meters, where the air flow transitions from laminar to turbulent along the inside surface of the cave b) calculate the x value, in meters, where the bulk steady state concentration of water vapor in the air flowing in the cave is 10% of the saturation concentration. assume the air at the surface of the water layer is 100% saturated with water vapor. assume the wind entering the cave contained no moisture before it entered the cave. take into account the transition from laminar to turbulent flow when solving part b
Answers: 1
You know the right answer?
A train blows its whistle as it moves rapidly towards a stationary observer. Which of the following...

Questions in other subjects: