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3 years ago

What causes the phenomenon of "red shift" and "blue shift" in astronomy? *

Physics

2 answers:

faltersainse [42]3 years ago

6 0

Answer:

doppler effect

Explanation:

prohojiy [21]3 years ago

5 0

The entire scientific Astronomical and Cosmological community assumes that it's the Doppler effect, since that's the only existing scientific explanation for the shifts in wavelengths away from what they're supposed to be. The whole theoretical structure of the "Big Bang" and the expanding universe is built on that understanding.

If anybody ever comes along and discovers another way for electromagnetic waves to get longer or shorter on their way to us through space, then the whole big bang and expanding universe may be out the window.

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Calculate the maximum absolute uncertainty for R if:

Radda [10]

Answer:

ΔR = 9 s

Explanation:

To calculate the propagation of the uncertainty or absolute error, the variation with each parameter must be calculated and the but of the cases must be found, which is done by taking the absolute value

The given expression is R = 2A / B

the uncertainty is ΔR = | $\frac{dR}{dA}$ | ΔA + | $\frac{ dR}{dB}$ | ΔB

we look for the derivatives

$\frac{dR}{dA}$ = 9 / B

$\frac{dR}{dB}$ = 9A ( $- \frac{1}{B^2 }$ )

we substitute

ΔR = $\frac{9}{B}$ ΔA + $\frac{9A}{B^2}$ ΔB

the values are

ΔA = 2 s

ΔB = 3 s

ΔR = $\frac{9}{11}$ 2 + $\frac{9 \ 32}{11^2 }$ 3

ΔR = 1.636 + 7.14

ΔR = 8,776 s

the absolute error must be given with a significant figure

ΔR = 9 s

3 0

3 years ago

A compact disc rotates from rest up to an angular speed of 31.4 rad/s in a time of 0.892 s.

Serggg [28]

Answer:

(a) α = 35.20 rad/s^2

(b) θ = 802°

(d) a = 156.64 cm/s^2

Explanation:

(a) To find the angular acceleration of the disc you use the following formula:

$\alpha=\frac{\omega-\omega_o}{t}$ (1)

w: angular speed of the disc = 31.4 rad/s

wo: initial angular speed = 0 rad/s

t: time = 0.892s

You replace the values of the parameters in the equation (1):

$\alpha=\frac{31.4rad/s-0rad/s}{0.892s}=35.20\frac{rad}{s^2}$

The angular acceleration of the disc, for the given time, is 35.20rad/s^2

(b) To calculate the angle describe by the disc in such a time you use:

$\theta=\frac{1}{2}\alpha t^2$ (2)

$\theta=\frac{1}{2}(35.20rad/s^2)(0.892s)^2=14.00rad$

In degrees you have:

$\theta=14.00rad*\frac{180\°}{\pi \ rad}=802\°$

The angle described by the disc is 802°

(c) To calculate the tangential speed of the microbe for t=0.892s, you use the following formula:

$v=\omega r$ (3)

w: angular speed for t = 0.892s = 31.4rad/s

r: radius of the disc = 4.45cm

$v=(31.4rad/s)(4.45cm)=139.73\frac{cm}{s}$

The tangential speed is 139.73 cm/s

(d) The tangential acceleration is calculated by using the following formula:

$a=\alpha r$

α: angular acceleration for t=0.892s

$a=(35.20rad/s^2)(4.45cm)=156.64\frac{cm}{s^2}$

The tangential acceleration is 156.64cm/s^2

7 0

2 years ago

If the half life of a decaying isotope is 10 years, which statement is true after 8 years

Mars2501 [29]

You need to tell us the different statements in order to answer your question

7 0

2 years ago

Read 2 more answers

A system where friction is considered and calculated

katrin [286]

Answer:

the answer is B :)

Explanation:

7 0

2 years ago

Why is water not suitable for a biometric fluid?

stiv31 [10]

Answer: water cannot be used as barometric liquid because it's density is lower than Mercury . water's density is 1000 gram per cubic meter. hence it requires a barometer whose height is around 11 meters.

Explanation:

Sorry if that dont make sense im not really good at math

6 0

3 years ago