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3 years ago

Astronomers estimate that new stars form in our galaxy at the rate of about

Physics

1 answer:

insens350 [35]3 years ago

7 0

Explanation:

The quantity at which the speed of formation of the star depends is called the "star formation rate".
Astronomers estimate that in our Galaxy the star formation rate is about 3 solar masses per year
According to "solar mass per year" the mass of interstellar gas and dust related to about 3 times the mass of the Sun goes into stars each year).
However, the whole of the mass doesn't necessarily go in the formation of 1 star.

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What does the word resolution mean in the sentence "By 1915, the British Roentgen Society had adopted a resolution to protect pe

iris [78.8K]

Resolution in this sentence refers to a solution to the problem

5 0

2 years ago

A constant friction force of 25 N acts on a 65-kg skier for 15 s on level snow. What is the skier’s change in velocity

nikdorinn [45]

Answer:

$\Delta v=5.77m/s$

Explanation:

Newton's 2nd Law relates the net force F on an object of mass m with the acceleration a it experiments by F=ma. In our case the net force is the friction force, since it's the only one the skier is experimenting horizontally and the vertical ones cancel out since he's not moving in that direction. Our acceleration then will be:

$a=\frac{F}{m}$

Also, acceleration is defined by the change of velocity $\Delta v$ in a given time t, so we have:

$a=\frac{\Delta v}{t}$

Since we want the change in velocity, mixing both equations we conclude that:

$\Delta v=at=\frac{Ft}{m}$

Which for our values means:

$\Delta v=\frac{Ft}{m}=\frac{(25N)(15s)}{(65Kg)}=5.77m/s$

4 0

3 years ago

Which items are matter?

svetoff [14.1K]

Answer:

which items are matter?

battery , mobile phone

5 0

2 years ago

Read 2 more answers

A planet's rotation determines the length of its day and its revolution determines the length of its year. A day on Earth is 24

Sholpan [36]

Explanation:

The speed of rotation of Venus is slower than that of Earth that is why a day on Venus is longerthan Earth's day. Whereas, Venus is closer to sun than Earth, this means Venus trajectory of revolution is smaller than that of Earth.Therefore, a year on Venus is shorter than Earth's year.

7 0

2 years ago

She leaves her campsite and runs north for 10 miles turns east and runs 8 miles then turns south and runs 2 miles.whats her dist

Mama L [17]

The distance is 20 miles

Explanation:

Definitions:

Distance is the total length of the path covered by an object during its motion, regardless of the direction of its motion
Displacement is the shortest distance between the initial and final position of the motion, so it also takes into account the direction of motion

In this problem, we want to know the distance covered by the woman. The motion consists of the following parts:

$d_1 = 10 miles$ north