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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 might you have if you dont feel well?

snow_lady [41]

You may have a cold if you do not feel well, depends on the symptoms

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2 years ago

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What is the advantage of having different shaped beaks? Question 4 options: To protect itself against prey. To be able to eat th

Pavlova-9 [17]

Answer:

To be able to eat the food readily available in the environment

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2 years ago

If we're interested in knowing the rate at which light energy is received by a unit of area on a particular surface, we're reall

Ad libitum [116K]

Illluminance is the measurement of photo-metric power. That means, illuminance is the rate of photo-metric flux that is received by a surface per area. It is usually expressed as a unit of W/m^2. Thus, from the choices, the answer we're looking for is illuminance.

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3 years ago

A baseball of mass 300-g is hit at a velocity of 40 m/s. If the ball is caught by the third baseman and the ball penetrates 2.0

OlgaM077 [116]

The force is -12,000 N

Explanation:

First of all, we calculate the acceleration of the ball, by using the following suvat equation:

$v^2-u^2=2as$

where:

v = 0 is the final velocity of the baseball (it comes to rest)

u = 40 m/s is the initial velocity

a is the acceleration

s = 2.0 cm = 0.02 m is the displacement of the ball

Solving for a,

$a=\frac{v^2-u^2}{2s}=\frac{0-40^2}{2(0.02)}=-40,000 m/s^2$

Now we can calculate the average force exerted on the ball, by using Newton's second law:

$F=ma$

where

m = 300 g = 0.3 kg is the mass of the ball

$a=-40,000 m/s^2$ is the acceleration

Substituting,

$F=(0.3)(-40,000)=-12,000 N$

where the negative sign indicates that the direction of the force is opposite to the direction of motion of the ball.

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2 years ago

The longer the time between the arrival of the P-wave and S-wave, the _______ is the epicenter.

Brrunno [24]

The longer the time between the arrival of the P-wave and S-wave, the <u>farther away</u> is the epicenter.

<h3>What is epicenter and the relation between P-wave and S-wave?</h3>

The point on the earth's surface vertically above the hypocenter (or focus), point in the crust where a seismic rupture begins is said to be epicenter.
There are two types of waves during earthquakes, they are:

P - wave
S - wave

Each seismograph records the times when the first (P waves) and second (S waves) seismic waves arrive.
From the graph, through the information, scientists can determine how fast the waves are traveling.
The longer the time between the arrival of the P-wave and S-wave, the farther away is the epicenter.

Hence, Option B is the correct answer.

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1 year ago