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diamong [38]
3 years ago
14

Why does an astronaut have to use electrical medium to talk in the space​

Physics
2 answers:
Evgen [1.6K]3 years ago
8 0

Explanation:

because there is no air to communicate

Mars2501 [29]3 years ago
8 0

yur answer mate hope it helps

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Imagine our Solar System is moving in the Milky Way towards a group of two stars. Star A is a Red star that is slightly closer t
Juliette [100K]

Answer:

None of the stars give of light that is red-shifted

Explanation:

Motion of the observer or the source will cause a change in the wavelength of a wave. This is known as the Doppler effect. When an object and observer are getting close, blue shift occurs i.e., the wavelength gets shorter. When an object and observer are getting farther red shift occurs i.e., the wavelength gets longer.

Here, both the stars are getting closer to us so blue shift will occur.

6 0
3 years ago
2075 Set A Q.No. 106 A Carnot engine has 40% efficiency with a sink at 10°C. By how many degrees should the temperature of the s
Anni [7]

Answer:

Explanation:

Efficiency of a Carnot engine = 1 – (T2/T1) ;

where T1 = source temperature  and T2 = sink temperature

T2 = 10⁰C = 273+10 = 283K

The initial efficiency = 40%

So 0.4 = 1 - (283/Initial T1)

Initial T1 = 283/(1-0.4) = 471.67 K

 

To raise efficiency to 65%

0.65 = 1 - (283/Increased T1)

Increased T1 = 283/(1-0.65) = 808.57 K

The source temperature must be increased by 808.57 - 471.67 = 336.9 K or 336.9°C.

8 0
3 years ago
Read 2 more answers
Por favor, necesito ayuda urgente 4. vectores perpendiculares de 25 y 40 unidades cada uno. Hallar gráfica y numericamente el ve
Darina [25.2K]

Answer:

4)  R = 47.17 units , 5)  R= 10,29 unidades, 6)   R= 2994,4 km ,    θ = -33,7

Explanation:

Este es un ejercicio de adición de vectores

4) como los vectores son perpendiculares.

Para encontrar la resultante podemos usar el teorema de pitoras

        R =  √ a² + b²

        R = √√ ( 25² + 40²)

        R =  47,17 unidades

5)  Este caso como el angulo es diferente de 90 debemos usar la relación de pitoras completa

        R² =  a² + b² + 2 a b cos θ

donde el angulo es entre los vectores a y b

        R² = 12² + 16² – 2 12 16 cos 40

        R²= 400 – 294,16

       R= 10,29 unidades

6) En este caso los dos desplazamientos son perpendiculares, por lo cual Usamos el teorema de Pitágoras

          R = √ (2400² + 1600²)

          R= 2994,4 km

para el angulo de este desplazamiento usamos trigonometría

           tan θ = y/x

           θ = tan⁻¹ y/x

           θ = tan⁻¹ 1600/(-2400)

           θ = -33,7  

TRASLATE

This is a vector addition exercise

4) as the vectors are perpendicular.

To find the result we can use the Poreor theorem

        R = √ a² + b²

        R = √ (25² + 40²)

        R = 47.17 units

5) This case, as the angle is different from 90, we must use the complete ratio of the pitoras

        R² = a² + b² + 2 a b cos θ

where the angle is between vectors a and b

        R² = 12² + 16² - 2 12 16 cos 40

         R² = 400 - 294.16

       R = 10.29 units

6) In this case the two displacements are perpendicular, which is why we use the Pythagorean theorem

          R = √ (2400² + 1600²)

          R = 2,994.4 km

for the angle of this displacement we use trigonometry

           tan θ = y / x

           θ = tan⁻¹ y / x

           θ = tan⁻¹ 1600 / (- 2400)

           θ = -33.7

3 0
3 years ago
What is the torque τa about axis a due to the force f⃗ ? express the torque about axis a at cartesian coordinates (0,0)?
pentagon [3]

Answer:

\tau_a = F a sin \theta

Explanation:

The torque of a force is given by:

\tau = F d sin \theta

where

F is the magnitude of the force

d is the distance between the point of application of the force and the centre of rotation of the system

\theta is the angle between the direction of the force and d

In this problem, we have:

F, the force

a, the distance of application of the force from the centre (0,0)

\theta, the angle between the direction of the force and a

Therefore, the torque is

\tau_a = F a sin \theta

5 0
3 years ago
Global average temperature increases when energy absorbed by the surface ___?
MAXImum [283]

Answer:

se elevator a maas eneergia mas alta

8 0
3 years ago
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