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2 years ago

Why is an absorption spectrum especially useful for astronomers?.

Physics

1 answer:

creativ13 [48]2 years ago

4 0

Answer:

It has dark lines in it that allow astronomers to determine what elements are in the star. red-shifted (shifted toward the red end of the light spectrum).

Explanation:

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Which object absorbs the most visible light

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The objects that look black are all tied for first place.

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3 years ago

The person with the greatest ___ hits earth first

Alinara [238K]

Answer

A because that’s what I learned

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3 years ago

Read 2 more answers

An electron of mass 9.11 x 10^-31 kg has an initial speed of 4.00 x 10^5 m/s. It travels in a straight line, and its speed incre

yarga [219]

Answer:

a. F = 2.32*10^-18 N

b. The force F is 2.59*10^11 times the weight of the electron

Explanation:

a. In order to calculate the magnitude of the force exerted on the electron you first calculate the acceleration of the electron, by using the following formula:

$v^2=v_o^2+2ax$ (1)

v: final speed of the electron = 6.60*10^5 m/s

vo: initial speed of the electron = 4.00*10^5 m/s

a: acceleration of the electron = ?

x: distance traveled by the electron = 5.40cm = 0.054m

you solve the equation (2) for a and replace the values of the parameters:

$a=\frac{v^2-v_o^2}{2x}=\frac{(6.60*10^5m/s)^2-(4.00*10^5m/s)^2}{2(0.054m)}\\\\a=2.55*10^{12}\frac{m}{s^2}$

Next, you use the second Newton law to calculate the force:

$F=ma$

m: mass of the electron = 9.11*10^-31kg

$F=(9.11*10^{-31}kg)(2.55*10^{12}m/s^2)=2.32*10^{-18}N$

The magnitude of the force exerted on the electron is 2.32*10^-18 N

b. The weight of the electron is given by:

$F_g=mg=(9.11*10^{-31}kg)(9.8m/s^2)=8.92*10^{-30}N$

The quotient between the weight of the electron and the force F is:

$\frac{F}{F_g}=\frac{2.32*10^{-18}N}{8.92*10^{-30}N}=2.59*10^{11}$

The force F is 2.59*10^11 times the weight of the electron

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3 years ago

A very small round ball is located near a large solid sphere of uniform density. The force that the large sphere exerts on the b

Mariana [72]

Answer:

Option e

Explanation:

The Law of Universal Gravitation states that every point mass attracts every other point mass in the universe by a force pointing in a straight line between the centers-of-mass of both points, and this force is proportional to the masses of the objects and inversely proportional to their separation This attractive force always points inward, from one point to the other. The Law applies to all objects with masses, big or small. Two big objects can be considered as point-like masses, if the distance between them is very large compared to their sizes or if they are spherically symmetric. For these cases the mass of each object can be represented as a point mass located at its center-of-mass.

The same force is applied to both the balls.

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3 years ago

Oil ________.

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Oil must be mined from underground.

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3 years ago