The answer is chemical energy.
In our body, our chemical energy comes in the form of glucose. It is glucose that is turned into mechanical energy in our body. When we move, our muscles act as a transducer. As muscles contract, they convert the glucose in our body into mechanical energy. The mechanical energy in our muscles is also called muscular energy.
Canoe will start from rest and reach to speed v = 0.30 m/s
so here we will have
now in this speed increase it will take 0.75 second of time
so we can find the acceleration of canoe as we know that acceleration is rate of change in velocity
now we can find the force on Canoe by using Newton's II law
here m = mass of girl + mass of canoe
m = 27 + 52 = 79 kg
now by above formula
so here it will have net force F = 31.6 N
<span>a=3.75m/<span>s2</span></span><span>F=17.0N</span><span>F=ma</span><span>17.0N=m(3.75<span>m<span>s2</span></span>)</span>m= 17/3.75
m= 4.53 kg
Since the Units presented are not in the International System we will proceed to convert them. We know that,
So the speed in SI would be
The change in frequency when the wave is reflected is
Or we can rearrange the equation as
f' = Apparent frequency
f = Original Frequency
c = Speed of light
Replacing,
Since the waves are reflected, hence the change in frequency at the gun is equal to twice the change in frequency
Therefore the increase in frequency is 2979.63Hz