Answer:
0.83m/s forward
Explanation:
Velocity is the displacement divided by time.
Velocity =
Displacement is the distance moved in a specific direction;
→ 6meters forward
← 3meters backwards
→ 7 meters forward
Net displacement =7m + 3m = 10m forward
So;
Velocity = = 0.83m/s forward
Answer:
B. At stage B, because the elastic is completely strecthed.
Explanation:
Try pulling a rubber band or something stretchable and take a piece of small paper (just enough to fit in the rubber band). now try to pull the rubber band into 3 levels.
1st level - pull the rubber band with a short force and see if the paper will travel farther.
2nd level - now pull the rubber band with a medium force and see if the paper will be much farther compared to the (1st level)
3rd level - pull the rubber band with full force and see if the paper is much farther compared to the (2nd level).
Disclaimer:
Just in case I gave the wrong answer "Please don't hate me"
Thank you.
When a car approaches you, the sound waves that reach you have a shorter wavelength and a higher frequency. You hear a sound with a higher pitch. When the car moves away from you, the sound waves that reach you have a longer wavelength and lower frequency.
?? ⬇️
An approaching source moves closer during period of the sound wave so the effective wavelength is shortened, giving a higher pitch since the velocity of the wave is unchanged. Similarly the pitch of a receding sound source will be lowered.
The Doppler effect is an effect observed in light and sound waves as they move toward or away from an observer. One simple example of the Doppler effect is the sound of an automobile horn. Picture a person standing on a street corner. A car approaches, blowing its horn.
Comparing two waves of the same wavelength, a higher frequency is associated with faster movement. Comparing two waves of different wavelengths, a higher frequency doesn't always indicate faster movement, although it can. Waves of different wavelengths can have the same frequency.
The pitch of a sound is our ear's response to the frequency of sound. Whereas loudness depends on the energy of the wave. ... The pitch of a sound depends on the frequency while loudness of a sound depends on the amplitude of sound waves.