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:
b liquids
Explanation:
this is because liquids take the shape of their container while solids stay solid and do not change shape and solids, liquids and gases all have definite volume.
Faster than. Hope this helps!!!
Answer is D. Nearsightedness is when a person can see near, but not far. Everything appears blurry from far away, but as you get close to it, it becomes more focused
That latest value for the Angle is in Grads, not in Kilograms.
Apply law of conservation of momentum along vertical direction.


Apply law of conservation of momentum along the horizontal direction





The second ball velocity is 
The magnitud of final total momentum is

The magnitude of final energy is
