Answer:
A) As the ambulance's siren moves toward a stationary hearer, the quality of sound will have a higher pitch
B) As the ambulance's siren moves away from a stationary hearer, the quality of sound will have a lower pitch.
Explanation:
From Doppler effect, the closer the source of sound gets to the observer, the higher the frequency and in turn the higher the pitch.
Meanwhile, the farther a source goes from an observer, the lower the frequency of the sound and also the lower the pitch.
Thus, as the ambulance's siren moves toward a stationary hearer, the quality of sound will have a higher pitch.
As the ambulance's siren moves away from a stationary hearer, the quality of sound will have a lower pitch.
A fundamental article cannot be Accelerated
The minimum speed with which the athlete must leave the ground is 2.21 m/s
From the question given above, the following data were obtained:
- Maximum Height (h) = 0.25 m
- Final velocity (v) = 0 (at maximum height)
- Acceleration due to gravity (g) = 9.8 m/s²
v² = u² – 2gh (going against gravity)
0² = u² – (2 × 9.8 × 0.25)
0 = u² – 4.9
Collect like terms
u² = 0 + 4.9
u² = 4.9
Take the square root of both side
u = √4.9
u = 2.21 m/s
Thus, the athlete must leave the ground with a minimum speed of 2.21 m/s.
Learn more about projectile motion:
brainly.com/question/15604286
Answer:
Chris Ford of the Boston Celtics, October 12, 1979
Explanation:
