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Anna71 [15]
3 years ago
9

One astronomer has observed an apparent lengthening of the electromagnetic waves given off by a star. Which of these conclusions

is correct about the star?Its parallax is increasing. It is moving towards Earth. Its wavelength is decreasing. It is moving away from Earth.
Physics
2 answers:
steposvetlana [31]3 years ago
5 0
I think the correct answer from the choices listed above is the last option. The conclusion about the star would be that it is moving away from  Earth. L<span>engthening of the waves means that wavelength getting larger </span>this occurs when a body giving off light is moving away. Hope this answers the question.
MA_775_DIABLO [31]3 years ago
4 0

Answer:

It is moving away from Earth.

Explanation:

The electromagnetic waves given off by a star is bring observed by an astronomer. The waves seem to be lengthening. This means the apparent wavelength of the waves is increasing. It can be explained from Doppler's effect. Doppler's effect states that there is change in apparent wavelength of light when there is relative motion between the source and the observer.

The apparent wavelength decreases when the source and observer approach each other while it increases when they are moving apart.

In the given situation, since the apparent wavelength is increasing, it means the star is moving away from the Earth and we are observing a red shift.

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Select ALL that apply. The stages of a human's lifespan include:
Alex787 [66]

Answer:

The answers are A and C

Explanation:

the order of a humans lifespan is: Infancy, early childhood, adolescence, adulthood, then elderly

6 0
3 years ago
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You hold a barbell in a horizontal position. The barbell’s center of mass is exactly mid-way between your two hands. A friend wa
Harrizon [31]

Explanation:

First consider that each hand works as a fulcrum: a pivot point where the barbell can rotate.

Now consider only the left hand. If the center of mass of the barbell is between hands (in the middle) it is displaced respect the fulcrum, therefore the weight which is pushing the bar downwards becomes a rotational force. The same thing happens to the other hand. Now, if more weight is added to the left hand the center of mass is displaced towards the left hand and depending how much weight is added, the center of mass will change its position and therefore the torque each hand experiences changes.

If the center of mass is still between hands: The torque remains almost the same changing only the magnitudes but not the direction.

If the center of mass is on the hand: there is no torque for the left hand because there is no leaver.

If the center of mass is to the left: now the torque changes direction and both hands need to stop it in the same direction.

(see diagram below)

6 0
3 years ago
PLEASE HELP I'M LOST.
Zina [86]
A - 3
B - 1
C - 2
D - 4
E - 5
6 0
3 years ago
Pls pls pls pls help!!!!!
Natasha2012 [34]

Answer:

The net upward force the man experiences is approximately 1,324.8 N

The net downward force the man experienced is approximately 556.8 N

Explanation:

The given mass of the man, m = 96 kg

The acceleration of the elevator, a = 4.0 m/s²

According to Newton's third law of motion which states that action ad reaction are equal and opposite, when the elevator moves upwards, we have;

The net force the man experiences, F = Gravitational force, m·g + The force of the elevator pushing upwards, m·a

∴ ↑F = m·g + m·a

Where;

F = The net force the man experiences

m = The mass of the man = 96 kg

g = The acceleration due to gravity ≈ 9.8 m/s²

a = The acceleration of the elevator = 4 m/s²

∴ ↑F = 96 kg × 9.8 m/s² + 96 kg × 4 m/s² ≈ 1,324.8 N

The net upward force the man experiences ≈ 1,324.8 N

When the elevator moves downwards, we have;

The net force the man experiences, F = Gravitational force, m·g + The loss of the gravitational force as the floor moves further downwards, -(m·a)

∴ F = m·g + -(m·a) = m·g - m·a

F = m·g - m·a

∴ ↓F = 96 kg × 9.8 m/s² - 96 k × 4 m/s² ≈ 556.8 N

The net downward force the man experienced ≈ 556.8 N

8 0
2 years ago
What is gravitational force??​
strojnjashka [21]

Answer:

the force of attraction between all masses in the universe

Explanation:

<em>Have a nice day </em>:)

8 0
2 years ago
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