PHYSICS HIGH SCHOOL

Which statement below is correct?A.
The Moon revolves around the Sun, but the Earth does not.

B.
The Earth-Moon system revolves around the Sun.

C.
The Earth revolves around the Sun-Moon system.

D.
The Sun revolves around the Earth-Moon system.

Answers

Answer 1
Answer:

The correct answer is:

(B) The Earth-Moon system revolves around the Sun.

Because the Earth revolves around the sun while the Moon revolves around the Earth.
Answer 2
Answer: B. THE EARTH AND MOON REVOLVES AROUND THE SUN

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How far away is Earth from the Sun?a. 93 miles
b. 93 thousand miles
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d. 93 billion miles

Answers

d. 93 billion miles

Earth, being the third planet from the sun is unique in the universe  because it is currently the only planet known to support life. Earth's distance from the sun is really one of  the key reasons why it is has widespread  life.Earth occupies what scientists sometimes call the Goldilocks zone. Its distance from the sun means its neither too hot nor too cold to support liquid water. Water is thought to be a key ingredient for life. The energy from the sun in just the right intensity and the availability of water on the earth make it possible for life to thrive on earth. Plants use both these resources for photosynthesis and make nutrients that are available to support the life of animals on the earth. 
The answer is c. 93 million miles.

a gust of wind blows an apple from a tree. As the apple falls, the gravitational force on the apple is 2.25N downward and the force of the wind on the apple is 1.05N to the right. Find the magnitude and the direction of the net force on the apple.

Answers


Vertical component =  2.25 N downward

Horizontal component = 1.05 N to the right

Magnitude of the net force = √ (2.25² + 1.05²)
                                              = √6.165 =              2.483 N  (rounded)

Direction of the net force = tan⁻¹ (1.05/2.25) to the right of downward

                                           = tan⁻¹ ( 7/15 ) to the right of downward

                                           = 25° to the right of downward (rounded)

The magnitude of the net force on the apple is \boxed{2.48{\text{ N}}}.

The direction of the net force is with vertical \boxed{25^\circ}.

Further explanation:

Here, we have to calculate the magnitude and the direction of the net force on the apple.

Given:

The gravitational force exerted on the apple is 2.25{\text{ N}}.

Force exerted by the wind on the apple is 1.05{\text{ N}}.

Formula and concept used:

The gravitational force is a universal force and it act in downward direction that is towards the center of the earth.

The direction of the force exerted by the wind on the apple is towards write side in the horizontal direction.

So, the angle between the gravitational force and force due to wind will be 90^\circ that is both the forces are perpendicular to each other.

Consider gravitational force is W and force due to wind is F.

So, the net force applied on the apple is,

\boxed{R=\sqrt {\left( {{W^2} + {F^2} + 2WF\cos \theta } \right)} }

Here, \theta is the angle between both the forces which is equal to the 90^\circ.

So, the above equation can be written as,

R=\sqrt {{W^2} + {F^2}}                                                                                   …… (1)

The direction of the net force can be written as,

\boxed{\phi={{\tan }^( - 1)}\left( {(F)/(W)}\right)}                                  ….. (2)

Calculation:

Substitute 2.25{\text{ N}} for W and 1.05{\text{ N}} for F in the equation (1).

\begin{aligned}R&=\sqrt {{{2.25}^2}+{{1.05}^2}}\n&=\sqrt {6.165}\n&=2.48{\text{ N}}\n\end{gathered}

For the direction,

Substitute 2.25{\text{ N}} for W and 1.05{\text{ N}} for F in the equation (2).

\begin{aligned}\phi&={\tan ^( - 1)}\left( {\frac{{1.05}}{{2.25}}} \right)\n&=25^\circ\n\end{aligned}

Thus, the net force on the apple is \boxed{2.48{\text{ N}}} and direction of the net force is with vertical \boxed{25^\circ}.

Learn more:

1. Water is a compound: brainly.com/question/1073452

2. Expansion of the gas with change in temperature: brainly.com/question/9979757

3. Two arrows are fired simultaneously with the speed of 30m/s brainly.com/question/2370982

Answer detail:

Grade: Senior School

Subject: Physics

Chapter: Force

Keywords:

Wind blow, apple falls, gravitational force, wind force, magnitude of force, direction of force, 2.25N downward, 1.05N, magnitude and direction, net force on apple.

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Answers

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Answers

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Answers

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Answers

Answer:

Explanation:

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where, I is the moment if inertia and ω is the angular velocity

As the star is collapsed, the radius decreases and hence the moment of inertia also decreases.

According to the law, the angular velocity increases, thus the rate of spinning increases.

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