Some extremely hot objects that emit
1 answer:
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Answer:
A )
Explanation:
This change in frequency observation occur due to doppler effect
if the wave source moves,In the time between one wave peak being emitted and the next, the source will have moved so that the shells will no longer be concentric. The wavefronts will get closer together in front of the source as it travels and will be further apart behind it. (see the graph)
when the person standing still in front of the ambulance, he will observe a <em>higher frequency </em>than before as the source travels towards them.
The pitch we hear depends on the frequency of the sound wave.
A high frequency corresponds to a high pitch
as we hear a higher frequency , it makes the <em>pitch higher</em> too
Answer:
(i) v = 44 m/s
(ii) a = 72 m/s^2
Explanation:
You have the following equation for the potion of a car:
(i) The instantaneous velocity is the derivative of x in time:
for t = 1 is:
(ii) The instantaneous acceleration is the derivative of the velocity:
for t = 1
Answer:
25 m
9.9 m/s
22 m/s
Explanation:
m = Mass of ball
v = Velocity
g = Acceleration due to gravity = 9.81 m/s²
Applying conservation of energy
The height above the ground is 5.09683+20 = 25.09683 m = 25 m
The ball's speed as it passes the window on its way down is 9.9 m/s
The speed of impact on the ground is 22 m/s