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3 years ago

Night vision glasses detect energy given off by objects as

2 answers:

8 0

Night vision glasses detect energy given off by objects as infrared waves. Infrared is a light rays that are longer than a light but shorter that radio waves. Thank you for posting your question here. I hope my answer helps.

Yuliya22 [10]3 years ago

6 0

Answer:

It detects the Infrared waves and use it to form image

Explanation:

As we know that all objects which are at temperature greater than zero kelvin.

So here when we use night vision glasses then in this case glass has property to detect the infrared waves radiated by the objects which are at room temperature.

So these night vision lens are sensitive to infrared waves and they used that part of the spectrum to form the image of an object.

Since at room temperature the spectrum given by the objects are lying in the range of visible range so here we can say that it is not visible at that lower temperature by their own.

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A weather balloon is inflated to a volume of 26.8 LL at a pressure of 744 mmHgmmHg and a temperature of 31.2 ∘C∘C. The balloon r

elena-s [515]

Answer:

43.96 L

Explanation:

We are given that

$V_1=26.8 L$

$P_1=744mm Hg$

$T_1=31.2^{\circ} C=31.2+273=304.2K$

$P_2=385mmHg$

$T_2=-14.8^{\circ}=273-14.8=258.2K$

We know that

$\frac{P_1V_1}{T_1}=\frac{P_2V_2}{T_2}$

$V_2=\frac{P_1V_1T_2}{P_2T_1}$

Substitute the values

$V_2=\frac{744\times 26.8\times 258.2}{385\times 304.2}$

$V_2=43.96 L$

Hence, the volume of balloon at -14.8 degree Celsius=43.96 L

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3 years ago

Two loudspeakers are about 10 m apart in the front of a large classroom. if either speaker plays a pure tone at a single frequen

Ronch [10]

The observed differences in amplitudes are due to interference between the sound waves. The decrease in amplitude is due to destructive interference of the waves and the increase in amplitude is due to constructive interference.

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3 years ago

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3. How are fossil fuels used to generate electrical energy?

Katena32 [7]

Um dia eu vou para os Estados Unidos aí nós vamos ser amigos?

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3 years ago

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As a woman walks, her entire weight is momentarily placed on one heel of her high-heeled shoes. Calculate the pressure exerted o

Inessa05 [86]

Answer:4.003 MPa

Explanation:

Given

Area of heel $A=1.64 cm^2\approx 1.64\times 10^{-4} m^2$

Mass of woman $m= 67 kg$

Pressure is defined as Force applied in over an area such that it is perpendicular to it i.e.

$Pressure=\frac{Force}{Area}$

$P=\frac{F}{A}$

$P=\frac{mg}{A}$

$P=\frac{67\times 9.8}{1.64\times 10^{-4}}$

$P=400.365\times 10^{4} Pa$

$P=4.003 MPa$

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3 years ago

A uniform piece of sheet steel is shaped as in the figure below. (Both axes are marked in increments of 2). Compute the x and y

Elena-2011 [213]

"increments of 8" means the major divisions are 0,8,16,24 ?

x axis, calculate the moment arms from 0 
3x4, 2x12, 1x20 
from an arbitrary C 
3(c-4) + 2(c-12) + (c-20) = 0 
3c - 12 + 2c -24 + c - 20 = 0 
6c = 56 
c = 9.33 

y axis 
3x3, 1x12, 2x20 
3(c-4) + 1(c-12) +2 (c-20) = 0 
3c - 12 + c - 12 + 2c - 40 = 0 
6c = 64 
c = 10.67 

so center is x = 9.33, y = 10.67

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3 years ago

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