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Nezavi [6.7K]
2 years ago
12

Astronomers were at first surprised to find complicated molecules in the interstellar medium. They thought ultra-violet light fr

om stars would break apart such molecules. What protects the molecules we observe from being broken apart
Physics
1 answer:
jeka57 [31]2 years ago
8 0

Answer:

The dust present in the clouds.

Explanation:

The complicated composition molecules that can be found in space are generally associated with clouds of dust. The significant amount of dust in these clouds provides protection not only for these molecules, but for any body that makes up or is associated with dust clouds.

It is exactly this dust that protects the molecules against the action of ultraviolet rays.

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A power washer is being used to clean the siding of a house. Water enters at 20 C, 1 atm, with a volumetric flow rate of 0.1 lit
VladimirAG [237]

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

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

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}

W=\frac{(0.1)(96480)-(0.1)(83930)+\frac{0.1(50^2-0.2^2)}{2}+0.1(9.81)(5)}{1.1}

W=1259W=1.2Kw

5 0
2 years ago
What is the first velocity of the car with four washers at
VARVARA [1.3K]

Answer:

0.28

0.56

Explanation:

5 0
2 years ago
Read 2 more answers
A stunt cyclist needs to make a calculation for an upcoming cycle jump. The cyclist is traveling 100 ft/sec toward an inclined r
Elena-2011 [213]

Answer:A=23.57^{\circ}

Explanation:

Given

velocity=100 ft/s

height of landing zone=10 ft

Equation of x(t)=100 t\cos (A)

y(t)=-16t^2+100t\sin (A)+10

Maximum height=35 feet

at maximum height

\frac{\mathrm{d} Y}{\mathrm{d} t}=0

\frac{\mathrm{d} x}{\mathrm{d} t}=-32t+100\sin A

t=3.125\sin A

At t=3.125\sin A

Y(t)=35=-16\times (3.125\sin A)^2+100\times 3.125\sin A\times \sin A+10

312.5\sin^2 A-156.25\sin^2 A=25

sin^2 A=0.16

A=23.57^{\circ}

8 0
2 years ago
Which pair of graphs represent the same motion of an object
ASHA 777 [7]
To be able to identify that the object is in the same motion, we should find the graphs that has an increasing slope of displacement and with the constant velocity with varying time. Graphs on letter D satisfies these requirements.

<em>ANSWER: D</em>
6 0
2 years ago
Read 2 more answers
Considering the activity series given for nonmetals, what is the result of the below reaction? Use the activity series provided.
Mariana [72]

Answer: The answer would be no reaction.

Explanation:

7 0
2 years ago
Read 2 more answers
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