Answer: 0.4 m
Explanation:
Given
Speed of ambulance, vs = 61.9 m/s
Speed of car = 28.5 m/s
Frequency of ambulance siren, f = 694 Hz
Velocity of sound in air, v = 343 m/s
With speed of ambulance being (61.9 m/s) -> We solve using
fd = f(v + vr) / (v - vs), where vr = 0
fd = 694 * (343 + 0) / (343 - 61.9)
fd = 694 * (343 / 281.1)
fd = 694 * 1.22
fd = 847 Hz
Recall,
λ = v/f
λ = 343/847
λ = 0.4 m
Therefore, the wavelength of the sound of the ambulance’s siren if you are standing at the position of the car is 0.4 m
Answer:
D. echolocation
<h2>
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Answer:
<h2>500 J</h2>
Explanation:
The gravitational potential energy of a body can be found by using the formula
GPE = mgh
where
m is the mass
h is the height
g is the acceleration due to gravity which is 10 m/s²
From the question we have
GPE = 5 × 10 × 10
We have the final answer as
<h3>500 J</h3>
Hope this helps you
Answer:
this question is very lengthy and even nit at all understandable so pls can u explain it in breif
The difference in the power required by the motor at start up and at operating speed is 9778.57
<h3>What is power? </h3>
This is defined as the rate in which energy is consumed. Electrical power is expressed mathematically as:
Power (P) = voltage (V) × current (I)
P = IV
Power = square voltage (V²) / resistance ®
P = V² / R
<h3>How to determine the power by the EMF</h3>
- Voltage (V) = 37 V
- Resistance (R) = 0.14 Ω
- Power by EMF (P₁) =?
P = V² / R
P₁ = 62² / 0.14
P₁ = 27457.14 watts
<h3>How to determine the power by the back EMF</h3>
- Voltage (V) = 62 V
- Resistance (R) = 0.14 Ω
- Power by back EMF (P₂) =?
P = V² / R
P₂ = 37² / 0.14
P₂ = 9778.57 watts
<h3>How to determine the power difference</h3>
- Power by EMF (P₁) = 27457.14 watts
- Power by back EMF (P₂) = 9778.57 watts
- Difference in power =?
Difference = P₁ - P₂
Difference in power = 27457.14 - 9778.57
Difference in power = 17678.57 watts
Learn more about electrical power:
brainly.com/question/64224
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