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Nezavi [6.7K]
3 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]3 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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Find the power of a force F~ = (8 N)ˆı + (−4 N) ˆ if the velocity ~v = (−7 m/s)ˆı + (1 m/s) ˆ. Answer in units of W
Vikki [24]

Answer:

P=-60W

Explanation:

From the question we are told that

Force of power F=8Ni+-4Nj

Velocity of power V=-7m/si+1m/sj

Generally the equation for power is mathematically represented as

Power=Force *Velocity

P=F *V

Generally the dot product of F and V is mathematically given as

P= \begin{vmatrix}8 & -4\end{vmatrix} .\begin{vmatrix}-7 & 1\end{vmatrix}  =-56-4

P=-60W

6 0
3 years ago
Cody's family went hiking along a stream in Georgia and found a waterfall. At the bottom of the waterfall, they noticed many sma
Vitek1552 [10]

Answer:

They can expect the size of the rocks to get smaller as the time passes.

Explanation:

They can expect the size of the rocks to get smaller as the time passes.

  • This is so because the water falling from certain height under waterfall will exert mechanical impact on the rock due to the mass of the water. This will act as water hammer <em>causing wear and tear</em> to the rock particles and flowing them away with the stream of water.
  • This hydraulic shock is generated when there is sudden stoppage in the motion of water. In sync with Newton's second law of motion, when the momentum of water is changed within a short course of time it creates a hammer like impact which has potential  of wear and tear when an object is continuously subjected to it.
4 0
3 years ago
An air conditioner is a refrigerator with the inside of the house acting as the cold reservoir and the outside atmosphere acting
Monica [59]

Answer:

1.89*10^8 J

Explanation:

The coefficient of performance of this device is \frac{Q}{W} where Q .is the useful heat supplied or removed by the considered system and W  is the work required by the considered system.

Step 1

Coeffiecient of perfromance for cooling (COPC) = 1.75 = \frac{Q}{W} .

                                                     Q = 1.75W

Step 2

We convert day into seconds:

1 day = 24 hrs = 86400 seconds

Step 3

Heat that can be extracted from the house in a day is:

Q = 1.75 * 1.25 * 10^3 * 86400 =  189000000 = 1.89*10^8 J

8 0
4 years ago
What is the formula for force
tresset_1 [31]

Force = Mass * Acceleration

6 0
3 years ago
An engine is designed to obtain energy from the temperature gradient of the ocean. What is the thermodynamic efficiency of such
rewona [7]

Answer:

0.035 (3.5 %)

Explanation:

The thermodynamic efficiency is given by:

\eta = 1 - \frac{T_C}{T_H}

where

T_C is the cold temperature

T_H is the hot temperature

In this problem we have

T_C = 5 ^{\circ}C+ 273 = 278 KT_H = 15^{\circ}C+273 = 288 K

So the efficiency is

\eta = 1 - \frac{278 K}{288 K}=0.035

6 0
3 years ago
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