A train traveling 80.0 kph is blowing its horn as it approaches a railroad crossing. The horn has a frequency of 300.0 Hz. Assume the speed of sound is 331.5 m/s. What is the observed frequency of the horn?

395 Hz

281 Hz

322 Hz

A fish in a flat-sided aquarium sees a can of fish food on the counter. to the fish's eye, the can looks to be 37 cm outside the aquarium.

Why are bulb filaments made of metals and not wood

Where in an atom would you expect to find electrons? protons? neutrons?

The chart shows the voltage of four electric currents. Which is best supported by the data in the chart? 1 Voltage of Currents Current Volts (V) 9.0 1.5 3.0 4.5 O Current w flows at a higher rate than Current Z.

Which of the following statements regarding the moon and Earth is correct? A. Earth and the moon are nearly the same age. B. Earth and the moon have nearly the same mass. C. Earth is tidally locked, while the moon spins on its axis. D.

A starship passes Earth at 80% of the speed of light and sends a drone ship forward at half the speed of light rela - tive to itself. Show that the drone travels at 93% of the speed of light relative to Earth.

Rubies are used in electronics

Two kids are on a merry-go-round that is turning at a constant rate. ariel is near the outer edge, and bob is closer to the center. ariel has answer (smaller, the same, or greater angular speed?

Visit this website and locate the element mercury, whose chemical symbol is Hg. Click on the square to read about the history, properties, and uses of mercury. Name three uses for mercury.

Ten seconds after starting from rest, a car is moving at 40 m/s. what is the car's acceleration in meters per second per second?