Ask question

Ask question

All categories

geniusboy [140]

3 years ago

6

An astronomer is observing a star which puzzles her. The lines in the star's spectrum indicates that the star is very hot and sh

ould therefore be blue. But the star looks reddish in photographs and in measurements of the continuous spectrum. What is one possible explanation of this puzzle

1 answer:

Firlakuza [10]3 years ago

5 0

Answer:

the stars which are red in color are cool.

Explanation:

The stars which has reddish color are cool in nature while those stars which has white and blue in color are very hot in nature. The stars change its color when they becomes hotter , first the star color reddish when they are cool but with increasing temperature it changes the color from reddish to orange then yellow. After yellow it turns green and finally get blue color when the stars are very very hot.

You might be interested in

A small marble attached to a massless thread is hung from a horizontal support. When the marble is pulled back a small distance

s2008m [1.1K]

Answer:

f' = 2 f

Explanation:

The frequency of the pendulum that swings in simple harmonic motion is given by :

$f={2\pi}\sqrt{\dfrac{l}{g}}$

Where

l is the length of pendulum

g is the acceleration due to gravity

If the length of the thread is increased by a factor of 4, such that, l' = 4 l, let f' is the new frequency such that,

$f'={2\pi}\sqrt{\dfrac{l' }{g}}$

$f'={2\pi}\sqrt{\dfrac{4l}{g}}$

$f'=2\times {2\pi}\sqrt{\dfrac{l}{g}}$

f' = 2 f

So, the new frequency of the pendulum will become 2 time of initial frequency. Hence, the correct option is (b) "2f"

3 0

3 years ago

Which statement correctly identifies a difference between the function of most arteries and veins?

olasank [31]

Answer:a

Explanation:

8 0

3 years ago

Dolphins communicate using compression waves (longitudinal waves). Some of the sounds dolphins make are outside the range of hum

Sphinxa [80]

Water is a really good conductor of sound so I would have to say that it would be to send the message underwater because a more dense medium produces a louder sound

8 0

3 years ago

Find the magnitude of the sum

umka21 [38]

Answer:

Approximately $3.01\; \rm m$ .

Explanation:

Decompose each vector into the sum of two vectors: a horizontal one (parallel to the arrow that points to the right) and a vertical one (parallel the arrow that points upwards.)

Vector $\sf A$ is horizontal and is at an angle of $0^\circ$ with the horizon.

Horizontal component of vector $\sf A$ : to the right, with a length of $5.00\; \rm m \cdot \cos\left(0^\circ \right) = 5.00\; \rm m$ .
Vertical component of vector $\sf A$ : $5.00\; \rm m \cdot \sin\left(0^\circ \right) = 0\; \rm m$ .

Vector $\sf B$ is at an angle of $30^\circ$ below the horizon.

Horizontal component of vector $\sf B$ : to the right, with a length of $\displaystyle 6.00\; \rm m \cdot \cos\left(30^\circ \right) = (6.00\; \rm m) \times \frac{\sqrt{3}}{2}\approx 5.19615\; \rm m$ .
Vertical component of vector $\sf B$ : downwards, with a length of $\displaystyle 6.00\; \rm m \cdot \sin\left(30^\circ \right) = 6.00\; \rm m \times \frac{1}{2} = 3.00\; \rm m$ .

Calculate the sum of vector $\sf A$ and vector $\sf B$ .

The horizontal component of vector $\sf A$ and vector $\sf B$ are opposite to one another. Therefore, the length of the horizontal component of $\sf (A + B)$ would be the difference between the length of the horizontal components of vector $\sf A\!$ and of vector $\sf B\!$ :

$\displaystyle (6.00\; \rm m) \times \frac{\sqrt{3}}{2} - 5.00\; \rm m \approx 0.196152\; \rm m$ .

The length of the vertical component of vector $\sf A$ is $0\; \rm m$ . Therefore, the length of the vertical component of $\sf (A + B)$ would be equal to the length of the vertical component of vector $\sf B$ , $\displaystyle 6.00\; \rm m \times \frac{1}{2} = 3.00\; \rm m$ .

Therefore, the length of the horizontal and vertical component of $\sf (A + B)$ are approximately $0.196152\; \rm m$ and $3.00\; \rm m$ , respectively. The length of vector $\sf (A + B)\!$ would be approximately:

$\displaystyle \sqrt{(0.196152\; \rm m)^{2} + (3.00\; \rm m)^{2}} \approx 3.01\; \rm m$ .

5 0

3 years ago

In which item is energy stored in the form of gravitational potential energy?

nekit [7.7K]

An apple in a tree is the answer

3 0

3 years ago

Read 2 more answers