हिंदी

Mahendra and Virat Are Sitting at a Distance of 1 Metre from Each Other. Their Masses Are 75 Kg and 80 Kg Respectively. What is the Gravitational Force Between Them? G = 6.67 X 10-11 Nm2/Kg2

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प्रश्न

Mahendra and Virat are sitting at a distance of 1 metre from each other. Their masses are 75 kg and 80 kg respectively. What is the gravitational force between them? G = 6.67 x 10-11 Nm2/kg

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उत्तर

Given : r = 1 m, m1 = 75 kg, m2 = 80 kg 
and G = 6.67 x 10 -11 Nm2/kg2
According to Newton’s law 

                                     `F  = (Gm_1m_2)/(r^2)`

                                    `F=(6.67 xx 10^(-11) xx 75 xx80)/1^2 n`

                                   ` = 4.002 xx 10^-7 N`

The gravitational force between Mahendra and Virat is 4.002 x 10-7

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2018-2019 (March) Balbharati Model Question Paper Set 2

संबंधित प्रश्न

Fill in the blank and explain the statement with reasoning:

 If the height of the orbit of a satellite from the earth surface is increased, the tangential velocity of the satellite will ...... 


Solve the problem.

How much time a satellite in an orbit at height 35780 km above earth's surface would take, if the mass of the earth would have been four times its original mass?


If the height of a satellite completing one revolution around the earth in T seconds is h1 meter, then what would be the height of a satellite taking  \[2\sqrt{2} T\] seconds for one revolution?


Calculate the critical velocity of the satellite to be located at 35780 km above the surface of earth.


Observe the figure and write the answers.

  1. Name the outer orbit.
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  3. Which various orbits are given in the figure?
  4. Give an example of a launch vehicle based on Newton’s third law.

Note the relationship between the entries in all the three columns in the table and rewrite the table.

Column-1
(Location)
Column-2
Height from the earth’s surface (km)
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g (m/s2)
Earth’s surface (average) 8.8 0.225
Mount Everest 36.6 9.81
The highest height ever reached by man made balloon 400 9.8
Orbit of spacecraft 35700 9.77
Orbit of communication satellite 0 8.7

Write a note on orbital velocity


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Why are some satellites called geostationary?


Numerical problem.

Calculate the speed with which a satellite moves if it is at a height of 36,000 km from the Earth’s surface and has an orbital period of 24 hr (Take R = 6370 km) [Hint: Convert hr into seconds before doing calculation]


Numerical problem.

At an orbital height of 400 km, find the orbital period of the satellite.


The orbital velocity of the satellite depends on its ______.


Write down the formula of orbital velocity.


Geostationary satellites are not useful for studies of the polar region.


The height of medium earth orbit above the surface of the earth is ______.


Complete the Following table.

Sr. no. Type of Satellite The names of Indian Satellite and launcher
(1) Navigational Satellite Satellite: ______
Launcher: ______
(2) Earth Observation Satellite Satellite: ______
Launcher: ______

Complete the following equations:


The orbit of a satellite is exactly 35780 km above the earth's surface and its tangential velocity is 3.08 km/s.

How much time the satellite will take to complete one revolution around the earth?

(Radius of earth = 6400 km.)


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