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wolverine [178]
3 years ago
13

Scientists have recently discovered one the smallest stars on record. How long will this star last

Physics
2 answers:
jok3333 [9.3K]3 years ago
4 0

Answer:

The correct answer is B.

Explanation:

Stars start their lives being dense clouds of gas and dust. After a star is formed, it begins to burn hydrogen and transform it into helium. Once the hydrogen is depleted, new stages of nuclear combustion begin, such as burning helium to obtain heavier elements. This stage is shorter in larger stars since the greater the mass of a star, the greater the temperature in its nucleus and the greater the rate of fusion of hydrogen into helium, with which the fuel is depleted more quickly.

Have a nice day!

Free_Kalibri [48]3 years ago
3 0

Answer:

I am thinking that it's c

Explanation:

hope that helps

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4 0
4 years ago
PLEASE HELP ME
son4ous [18]

Answer:

synthesis is correct answer.

6 0
3 years ago
You are pulling a sled using a horizontal rèpe, as shown in the diagram. The rope pulls the sled. exerting a force of 50 N to th
Luden [163]

Answer:

Explanation:

From your other post, the complete question is:

"You are pulling a sled using a horizontal rèpe, as shown in the diagram. The rope pulls the sled. exerting a force of 50 N to the right. The snow exerts a friction force of 30 N on the sled to the left. The mass of the sled is 50 kg.

Find the sum of the force on the sled.

Determine the acceleration of the sled .

If the sled has an initial velocity 2m/s to the right, how fast will it be traveling after 5 seconds?

"

Given the rope exerting a force of 50 N to the right and the snow exerts a friction force of 30 N to the left, the sum of forces

= 50 - 30

= 20N to the right

The mass of sled is 50 kg and force = mass * acceleration.

Acceleration = Force / mass

= 20 / 50 = 0.4 m/s^2 to the right

If the sled has an initial velocity 2m/s to the right, after 5 seconds it will be traveling at initial velocity + acceleration * time

= 2 + 0.4*5

= 4 m/s to the right

3 0
3 years ago
Read 2 more answers
A second hand on a clock has a radius of 10 cm what is the circumference of a circle around which the secondhand travels
hram777 [196]
The answer has got to be 91
6 0
3 years ago
A particle leaves the origin with a speed of 2.1 times 106 m/s at 30 degrees to the positive x axis. It moves in a uniform elect
Verizon [17]

Answer:

-1449.69404 N/C

Explanation:

u = Velocity of particle = 2.1\times 10^6\ m/s

\theta = Angle = 30°

x = Distance = 1.5 cm

m = Mass of electron = 9.11\times 10^{-31}\ kg

q = Charge of electron = -1.6\times 10^{-19}\ C

In the case of projectile motion

x=utcosA\\\Rightarrow t=\dfrac{x}{ucosA}

The force of on the particle will balance the Electric force

ma=qE\\\Rightarrow a=\dfrac{qE}{m}

Now

y=utsin\theta-\dfrac{1}{2}at^2\\\Rightarrow y=utsin\theta-\dfrac{1}{2}\dfrac{qE}{m}t^2

If y = 0

0=utsin\theta-\dfrac{1}{2}\dfrac{qE}{m}t^2\\\Rightarrow utsin\theta=\dfrac{1}{2}\dfrac{qE}{m}t^2\\\Rightarrow t=\dfrac{2musin\theta}{qE}

\dfrac{x}{ucosA}=\dfrac{2musin\theta}{qE}\\\Rightarrow E=\dfrac{2mu^2sin\theta cos\theta}{xq}\\\Rightarrow E=\dfrac{2\times 9.11\times 10^{-31}\times (2.1\times 10^6)^2\times sin30\times cos30}{1.5\times 10^{-2}\times (-1.6\times 10^{-19})}\\\Rightarrow E=-1449.69404\ N/C

The electric field is -1449.69404 N/C

8 0
3 years ago
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