Answer:
The frequency of sound heard by the boy is 1181 Hz.
Explanation:
Given that,
Frequency of sound from alarm 
Speed = -8.25 m/s
Negative sign show the boy riding away from the car
Speed of sound = 343
We need to calculate the heard frequency
Using formula of frequency

Where,
= frequency of source
= speed of observer
= speed of source
= speed of sound
Put the value into the formula

here, source is at rest


Hence, The frequency of sound heard by the boy is 1181 Hz.
Answer:
A. 112 J
Explanation:
KE = ½mv² = ½(0.14)40² = 112 J
Answer:
KE = 1/2mv^2
KE = 1/2(24)(3^2)
KE = 12(9)
KE = 108 J
Let me know if this helps!
Since they are made of different chemical make ups, boiling point and density they will most likely be in different groups on the periodic table.
An Active solar energy system because it uses the sun to heat up the green house an I’m return the plants grow an produce food