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Energy can only be converted from one form to another
eg kinetic energy is converted to heat energy
Density = mass/volume = 75/25 = 3 g-mL. Hope this helps!
Answer: 20.4 miles
Explanation:
Here we need to use the equation:
Velocity = Distance/Time.
Initially we have that he can travel 30 miles in 2 hours, so the velocity is:
V = 30mi/2h = 15mph
Now, we reduce the velocity by 3 mph, so the new velocity is 15mph - 3 mph = 12mph.
Now we want to know the distance traveled in 1.7 hours with this velocity, this is.
Velocity*Time = Distance
12mi/h*1.7h = 20.4 miles
The frequency heard by an observer in the moving car as he approaches the police car is 558.6 Hz.
<h3>Frequency hear by the observer</h3>
The frequency heard by the observer is calculated by applying the principle of Doppler effect.
f₀ = f'[(v/v - vs)]
where;
- f₀ is the observed frequency
- v is speed of sound = 343 m/s
- vs is the speed of the source
f₀ = 500[(343 / 343 - 36)]
f₀ = 500(343/307)
f₀ = 558.6 Hz
Thus, the frequency heard by an observer in the moving car as he approaches the police car is 558.6 Hz.
Learn more about frequency here: brainly.com/question/10728818
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