Question

Hii , Guys please Answer All the Question :-

☆How planets keeps on moving in solar system ? (4 Marks)
☆Give Any 5 importance of universal law of gravitation. (5 Marks)
☆Derive the relation between small g and Capital G. (4 Marks)
☆How does the value of g changes from place to place & where it is maximum ? (4 Marks)
☆State the factors on which pressure depends & also on which does not depends. (5 Marks)
☆What is phenomenon of floating? (4 Marks)
☆What is relative Density? (3 Marks)

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Answer 1

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All the planets moving around the sun by the follow of Newton's third law ( EVERY ACTION HAS IT'S EQUAL OR OPPOSITE REACTION ). due to which they are apply forces both of them sun and the planets but the equalized and move around its fixed axis.

the five importance of Universal's law of gravitation are:

he most important part about this is not only that objects pull on each other, but that two objects attract each other with a force that is proportional to the product of their masses and inversely proportional to the square of the distance between them. This is known as Newton's law of universal gravitation. What this means is that for any two objects in the universe, the gravity between these two objects depends only on their mass and distance.

We can also express this relationship in equation form: F = G * (m1*m2) /d^2, where F is the gravitational force,G is the universal gravitational constant 6.67 x 10^-11 Nm^2/kg^2, mis the mass of each object, and d is the distance between their centers.

Gravity Gets Weaker with Distance

The distance between two objects is an important component of the law of universal gravitation. It's not just how far away the objects are from each other, it's the SQUARE of that distance. So, for example, if two objects are 3 kilometers away from each other, you can't just divide by 3 to get the gravitational force - you have to divide by 3 x 3, which is 9.

And if the objects are 9 kilometers away from each other you have to divide by 81. So, even though the objects are only 3 times as far from each other, the force is actually going to be 9 times weaker - that's a big difference!

This idea of an exponential decrease describes the inverse-square law. As you just saw, increasing the distance only a small amount decreases the force by a large amount, because the square of the distance is inversely proportional to the force.

It might help to think about this concept with a can of spray paint and a wall. The paint can will spray paint out in all directions from the nozzle, not just in a straight line, right? So, let's say you have your can of paint and you stand very close to the wall - only 1 meter away. When you spray the wall your paint covers a certain area; let's call it one unit.

If you move away from the wall to a distance of 2 meters, the paint you spray toward the wall will cover a larger area but with the same amount of paint as before. The area you cover is not twice as big - it's four times as big because your can sprays paint in all directions - the area is both twice as tall and twice as wide as before. If you step back yet again, this time to a distance of 3 meters, the area your paint covers is now 9 units because it is BOTH three times as tall and three times as wide as your original unit of area. Remember, you're still spraying the same amount of paint but over a larger area, so, the paint is 'weaker' all around

3... Relation between g and G. Using F = ma we know that the force on a mass m at a point where the gravitational intensity of a planet is g is mg. But this force is also given by F = GMm/r2 where M is the mass of the planet and r is the distance from its centre 

4.. Its value is 9.8 m/s2 on Earth. That is to say, the acceleration of gravity on the surface of the earth at sea level is 9.8 m/s2. ... There are slight variations in the value of g about earth's surface. These variations result from the varying density of the geologic structures below each specific surface location.

Assuming that entire mass of the earth is concentrated at its center, the gravity would be maximum where the radius would be minimum. Hence, at the equator, the value is minimum and at the poles the value is maximum.

4.. Pressure ulcers are caused by intrinsic and extrinsic factors. The intrinsic factors include immobilization, cognitive deficit, chronic illness (eg,diabetes mellitus), poor nutrition, use of steroids, and aging. There are 4 extrinsic factors that can cause these wounds—pressure, friction, humidity, and shear
An increase in the number of gas molecules in the same volume container increases pressure. A decrease in container volume increases gas pressure. An increase intemperature of a gas in a rigid container increases the pressure

5..
About Phenomenon of Floating. in Phenomenon of Floating, Gonsalves embodies the feeling of weightlessness with a womanfloating through water into forever, space. Notice the two-dimensional quality of the stars: some reflect brightly off the water, while others shine softly through the trees.

6..Relative density, or specific gravity, is the ratio of the density of a substance to the density of a given reference material. Specific gravity usually means relative density with respect to water. ... For example, an ice cube, with a relative density of about 0.91, will float.

the ratio of the density of a substance to the density of a standard, usually water for a liquid or solid, and air for a gas.

Answer 2

Ans.1→Very basically, each planet is being drawn in toward the Sun’s gravity, which gives them their momentum, but at the same time their centrifugal force is throwing them outward, trying to escape from the Sun. When the two forces are equal they assume an orbit and just keep going. Lots of maths to go with this but this is the basic concept.

Ans.2→universal law of gravitation has a lot of importance

1)we can understand how and why the planets revolve around the sun and how satellite revolved around the planets

2)it explains how the planets are held by the sun and why don't they fall on sun

3)it can also explain how is tided formed of earth , it can be due to the gravitational forces of sun moon etc as there will be low tides on no moon day and high tides on new moon day

4)it can also explain how far the gravitational force exists between the bodies in the universe 

5)gravity in different planets is different and there is a universal gravitational constant whose values is 6.674 x 10∧-11

Ans.3→G stands for Newton's universal gravitational constant, whereas g stands for the acceleration due to gravity at a certain point.

G = 6.67300 × 10-11 N.m2.kg-2. G is a constant throughout space and time.

g = 9.8 m.s-2.   g is a variable quantity.

G is a scalar quantity whereas g is a vector qualtity.  

(According to Newton's law of universal gravitation the force of attraction between two bodies is given by F = GMm/r2, where the symbols stand for their usual well known meanings. Also the weight of a body of mass m is F = mg.

So mg = GMm/r2,  

or g = GM/r2

g is a constant at a given location, which depends upon M and r.)

Ans.4→Gravity depends on the distance between the object and the center of the Earth, it is minimum at the equator and maximum at Pole bcz of the shape of the Earth, it varies with altitude, latitudes and mineral deposits in side the Earth. Gravity also depends on the mass.

Ans.5→ Depend⇒(1)It depends on force applied.

(2)Area over in which force acts.

Ans.6→In Phenomenon of Floating, Gonsalves embodies the feeling of weightlessness with a woman floating through water into forever, space. Notice the two-dimensional quality of the stars: some reflect brightly off the water, while others shine softly through the trees.

Ans.7→If density of any material is defined as the ratio of its density to that of another material(generally water ), it is called as relative density.

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