Un camión se encuentra parado en un reten de carros hecho por la policía. El camión pita y lo hace con una frecuencia de 400 Hz. Cuál es la frecuencia del policía de
carreteras que percibe el sonido y quien camina con una velocidad de 10 m/s
alejándose del camión . Tenga en cuenta que la velocidad del sonido es de 340 m/s.

What would the difference of spectral lines emitted by hydrogen gas in distant galaxies which is normally found at a wavelength of 21 cm on earth, be observed at 21.1 centimeters?

Acrow drops a 0.11kg clam onto a rocky beach from a height of 9.8m. what is the kinetic energy of the clam when it is 5.0m above the ground? what is its speed at that point?

Choose the most likely outcome of this scenario: jen decided to go bike riding without a helmet. while no one is around during her ride, she is thrown from her bike when her wheel goes into a pothole. she is not injured, but she is terrified to get back on her bike. what happens next? a. her physical health is affected even though she wasn't hurt. b. her mental and emotional health are affected because she is afraid to get back on her bike. c. her social health is affected because she is worried her friends saw the fall. d. her overall health is not affected at all by her fall.