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3 years ago

Does Sun burn? If yes, it burns without Oxygen?

2 answers:

5 0

The sun burns, but it does not nuclear burn. Since their is not oxygen, it burns <span>hydrogen to helium, and uses catalysts to speed up the reaction. </span>

Natali [406]3 years ago

5 0

- - The sun burns, giving it us heat and its heat alone. Without the sun burning the world would turn cold. And it does not burn with oxygen.

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A cannon, positioned on a hill, shoots a cannonball horizontally at 23 m/s. The cannonball hits the stone wall 1.96 m below the

irina [24]

Answer: 14. 49 m

Explanation:

We can solve this problem with the following equations:

$x=V_{o} cos \theta t$ (1)

$y-y_{o}=V_{o} sin \theta t-\frac{1}{2}gt^{2}$ (2)

Where:

$x$ is the horizontal distance between the cannon and the ball

$V_{o}=23 m/s$ is the cannonball initial velocity

$\theta=0\°$ since the cannonball was shoot horizontally

$t$ is the time

$y=0$ is the final height of the cannonball

$y_{o}=1.96 m$ is the initial height of the cannonball

$g=9.8 m/s^{2}$ is the acceleration due gravity

Isolating $t$ from (2):

$t=\sqrt{-\frac{2(y-y_{o})}{g}}$ (3)

$t=\sqrt{-\frac{2(0 m-1.96 m)}{9.8 m/s^{2}}}$ (4)

$t=0.63 s$ (5)

Substituting (5) in (1):

$x=(23 m/s) cos(0\°) 0.63 s$ (6)

Finally:

$x=14.49 m$

5 0

3 years ago

What will be the restoring force if a spring with a spring constant of 45 newtons per meter is pulled 0.03 meters in the downwar

allsm [11]

To calculate for the force in a spring, we use Hooke's Law which relates force and the displacement of the spring. It is said that the force is directly proportional to the displacement. So, it will have the equation F = kx where k is a constant and it is the spring constant.

F = kx
F = 45 N/m (0.03)
F = 1.35 N

8 0

3 years ago

I WILL MARK BRAINLIEST!

Nitella [24]

i had a stroke

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Explanation:

7 0

3 years ago

The magnetic domains in an iron nail are randomized unless it is placed in a magnetic field.

UNO [17]

Answer:

True plz thank me this is the answer

3 0

3 years ago

List the two key components of kinetic energy

fomenos

Answer:

no energy is lost or gained when molecules collide

molecules are constant, linear motion

Explanation:

6 0

4 years ago