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3 years ago

A hydrogen line in a star's spectrum

Physics

1 answer:

Serhud [2]3 years ago

5 0

Answer: V = 4.35 × 10^12 m/s

Explanation: To calculate Rigel velocity relative to us, we should use doppler effect formula.

Fo = (c ) / ( c - Vs) × f

Fo/f = (c ) / ( c - Vs)

4.26 × 10^10 = (3×10^8) 6.17×10^14/(3×10^8 - V)

4.26×10^10/6.17×10^14 = (3×10^8)/(3×10^8 - V)

6.9×10^-5 = (3×10^8)/(3×10^8 - V)

Cross multiply

20713.13 - 6.9×10^-5V = 3×10^8

Collect the like terms

6.9×10^-5V = 3×10^8 - 20713.13

6.9×10^-5V = 299979286.9

V = 299979286.9/6.9×10^-5

V = 4.3475 × 10^12 m/s

Therefore, Rigel's velocity relative to us is 4.3475 × 10^12 m/s

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Please help fast!! I need this in less than 17 hours!

djyliett [7]

SOLUTION is given in attachment below.

7 0

3 years ago

Equations to use: v= λ ∙ f v=d/t

Margarita [4]

b. 460.8 m/s

Explanation:

The relationship between the speed of the wave along the string, the length of the string and the frequency of the note is

$f=\frac{v}{2L}$

where v is the speed of the wave, L is the length of the string and f is the frequency. Re-arranging the equation and substituting the data of the problem (L=0.90 m and f=256 Hz), we can find v:

$v=2Lf=2(0.90 m)(256 Hz)=460.8 m/s$

c. 18,000 m

Explanation:

The relationship between speed of the wave, distance travelled and time taken is

$v=\frac{d}{t}$

where

v = 6,000 m/s is the speed of the wave

d = ? is the distance travelled

t = 3 s is the time taken

Re-arranging the formula and substituting the numbers into it, we find:

$d=vt=(6,000 m/s)(3 s)=18,000 m$

3 0

3 years ago

What is the lowest and highest mass the triple beam balance can measure

Artemon [7]

Well, the lowest mass a triple beam balance can measure is 0

8 0

3 years ago

A bungee cord stretches 25 meters and has a spring constant of 140 N/m. How much energy is stored in the bungee cord

goldenfox [79]

Answer:

The energy stored in the bungee cord is 43,750 J.

Explanation:

Given;

extension of the bungee cord, x = 25 m

spring constant of the bungee cord, k = 140 N/m

The elastic potential energy stored in the bungee cord is calculated as;

U = ¹/₂kx²

U = ¹/₂(140)(25)²

U = 43,750 J

Therefore, the energy stored in the bungee cord is 43,750 J.

5 0

3 years ago

A 4.33 kg ball is dropped from the roof of a building 157.2 m high. While the ball is falling to Earth, a horizontal wind exerts

laiz [17]

Answer:

The ball takes 5.66 seconds to hit the ground.

Explanation:

In this problem, the horizontal wind that interferes with the ball doesn't affect the time in which the balls hit the ground.

To find this time this is the equation for kinetic energy:

$d=\frac{1}{2}gt^2$

Where d is the distance, g is the acceleration of gravity and t is the time that you have to find, you can solve this equation to find t:

$t=\sqrt{\frac{2d}{g}}$

Replace the values:

$t=\sqrt{\frac{2(157.2m)}{9.81/s}}$

t=5.66 s

3 0

3 years ago