Answer:
Em = 30 J
Explanation:
The principle of conservation of mass and energy is one of the most important in physics, it establishes that energy cannot be created just by transforming it.
Therefore, the mechanical energy at a point is the same throughout the movement, only in some parts it will be kinetic, in others potential and in the intermediate points a mixture of the two, but the total value is always the same.
Em = K + U
Em = 17.5 + 12.5
Em = 30.0 J
At the point just before touching the ground the mechanical energy is the same Em = 30 J
Answer:
W=1259W=1.2Kw
Explanation:
Hello!
The first step to solve is to find the enthalpies at the entrance (state 1) and the exit of the washer, for this we use the thermodynamic tables.
Through laboratory tests, thermodynamic tables were developed, these allow to know all the thermodynamic properties of a substance (entropy, enthalpy, pressure, specific volume, internal energy etc ..)
through prior knowledge of two other properties such as pressure and temperature.
state 1
h1(T=20C,P=1atm)=83.93kJ/kg
state 2
h1(T=23C,P=1atm)=96.48kJ/kg
now we find the mass flow remembering that it is the product of the flow rate by the density=
m= mass flow
![M=\alpha q](https://tex.z-dn.net/?f=M%3D%5Calpha%20q)
q=flow=0.1l/S=0.0001M^3/s
α=Density=1000kg/m^3
m=0.1kg/s
Now we draw the energy flows in the washer (see attached image) and propose the first law of thermodynamics that states that the energy that enters must be equal to the one that comes out
![mh1+W+\frac{v1^2}{2g} =0.1W+mh2+\frac{v2^2}{2g}+mgH](https://tex.z-dn.net/?f=mh1%2BW%2B%5Cfrac%7Bv1%5E2%7D%7B2g%7D%20%3D0.1W%2Bmh2%2B%5Cfrac%7Bv2%5E2%7D%7B2g%7D%2BmgH)
where
m=mass flow
h=entalpy
v=speed
W=power input
g=gravity
H=height
SOLVING FOR W
![W=\frac{m2h2-m1h1+m\frac{v2^2-v1^2}{g}+mgH}{1.1}](https://tex.z-dn.net/?f=W%3D%5Cfrac%7Bm2h2-m1h1%2Bm%5Cfrac%7Bv2%5E2-v1%5E2%7D%7Bg%7D%2BmgH%7D%7B1.1%7D)
![W=\frac{(0.1)(96480)-(0.1)(83930)+\frac{0.1(50^2-0.2^2)}{2}+0.1(9.81)(5)}{1.1}](https://tex.z-dn.net/?f=W%3D%5Cfrac%7B%280.1%29%2896480%29-%280.1%29%2883930%29%2B%5Cfrac%7B0.1%2850%5E2-0.2%5E2%29%7D%7B2%7D%2B0.1%289.81%29%285%29%7D%7B1.1%7D)
W=1259W=1.2Kw
Same reason we don't fall into the Sun<span>. We are ... On the other hand, it </span>doesn't crash into the Earth<span> because it has a tangential velocity (like swinging a yo-yo around yourself).</span>
The amount of water given is a control. D) because, if a plant grows bigger as a result of the water, and not the sun this would disrupt the experiment.
Answer:
It is easy to separate sand and water by filtering the mixture. Salt can be separated from a solution through evaporation. The water can also be recovered as well as the salt if the water vapour is trapped and cooled to condense the water vapour back into a liquid. This process is called distillation.
Hope I was able to help! Mark me brainly it would help a lot!:)