Answer:
When Helium is identified by astronomers is one of the great triumphs of spectroscopy.
Explanation:
Janssen managed to do this great triumphs on August 18, 1868 . Janssen was the first person to introduce the helium, an element that never seen before on Earth, in the solar spectrum. At that time, he didn’t know that what he’d seen—he just think that it was something new. In the mid of 1800, the spectroscope instrument is introduced in astronomy.
Later on we heard that all helium in Universe has been created by the fusion of hydrogen nuclei.
To know more about Spectroscopy:
brainly.com/question/14677550
#SPJ4
Please show me your choices
Explanation:
if <em><u>the temperature changes , the liquid in the thermometer expands by a certain fixed amount, independent on the shape and the diameter of the capillary, only dependent on the amount of liquid. You can imagine but we'll see height difference upon a temperature changes if diameter is not </u></em><em><u>constant</u></em>
<em><u>hope</u></em><em><u> it</u></em><em><u> helps</u></em><em><u> you</u></em><em><u> like</u></em><em><u> </u></em><em><u>me </u></em><em><u>plz</u></em>
Answer:
The block is moving 0.564 m/s after the bullet emerges it.
Explanation:
<u>Step 1:</u> Data given
Mass of the bullet m = 4.86 grams = 0.00486 kg
Initial speed of the bullet u = 306 m/s
Mass of the wooden block m' = 1.37 kg
Final speed of the bullet v = 147 m/s
Initial speed of the block u'= 0 m/s
Final speed of the block = v'
<u>Step 2:</u> conservation law of momentum
mu + m'u' = mv + m'v'
0.00486*306 + 1.37 * 0 = 0.00486*147 + 1.37*v'
1.48716 = 0.71442 + 1.37 v'
0.77274 = 1.37 v'
v' = 0.564 m/s
The block is moving 0.564 m/s after the bullet emerges it.
The gravitational force will decrease when we increase the distance between the objects and decrease the mass of both objects.
<h3>What are the factors affecting gravitational force?</h3>
The factors affecting gravitational force are the masses of the objects and the distance separating the objects.
The gravitational force increases with increase in mass and decreases with increase in distance of separation and vice versa.
Therefore, the gravitational force will decrease when we increase the distance between the objects and decrease the mass of both objects.
Learn more about gravitational force at: brainly.com/question/11359658
#SPJ1
