Home
Class 11
PHYSICS
Molecules in air in the atmosphere are a...

 Molecules in air in the atmosphere are attracted by gravitational force of the earth. Explain why all of them do not fall into the earth just like an apple falling from a tree. 

Text Solution

Verified by Experts

`implies` The molecules in air are not heavy as compared to apple. So, molecules in air also have motion due to thermal velocity.
Doubtnut Promotions Banner Mobile Dark
|

Topper's Solved these Questions

  • GRAVITATION

    KUMAR PRAKASHAN|Exercise Section - D NCERT Exemplar Solutions ( Short Answer Type Question )|6 Videos

  • GRAVITATION

    KUMAR PRAKASHAN|Exercise Section - D NCERT Exemplar Solutions (Long Answer Type Question )|5 Videos

  • GRAVITATION

    KUMAR PRAKASHAN|Exercise Section - D NCERT Exemplar Solutions (MIultiple Choice Questions (More than one options) )|1 Videos

  • LAW OF MOTION

    KUMAR PRAKASHAN|Exercise (QUESTION PAPER) SECTION-D|1 Videos

Similar Questions

Explore conceptually related problems

The moon is acted upon by the gravitational force of earth. Why does not moon fall on to earth?

The earth and the moon are attracted to each other by gravitational force. Does the earth attract the moon with a force that is greater or smaller or the same as the force with which the moon attracts the earth ? Why?

Knowledge Check

  • An apple detached from the tree falls on the earth. The force acting on the apple by the earth is F_1 and that acting on the earth by the apple is F_2 , then

    A
    `F_1gt gt F_2`
    B
    `F_2 gt gt F_1`
    C
    `F_1 gt F_2`
    D
    `F_1=F_2`

    • Similar Questions

    Explore conceptually related problems

    Take an empty plastic bottle . Close the mouth of the bottle with an airtight stopper . Put it in a bucket filled with watere . The bottle floats . Push the bottle into the water. You feel an upward push. Try to push it further down. You will find it difficult to push deeper and deeper. Water exerts a force on the bottle in upward direction. Now release the bottle. It bounces back to the surface. Does the force due to the gravitational attraction of the earth act on this bottle? If so, why doesn't the bottle stay immersed in water after it is released ?

    An apple of mass 150 g falls on the surface of the earth from a negligible height (in comparison with the radius of the carth) due to gravitation. Calculate the gravitational force acting between the apple and the earth. Also calculate the acceleration produced in both of them due to the gravitational force. ("Mass of the earth "= 6 xx 10^(24) kg and Distance between the centre of the earth and the apple =6.38 xx 10^(6)m).

    Name the type of energy from sea that we get due to the gravitational pull of mainly the moon on the spinning earth and the level of water in the sea rises and falls.

    Name the type of energy from sea that we get due to the gravitational pull of mainly the moon on the spinning earth and the level of water in the sea rises and falls.

    A rain drop of radius 2 mm falls from a height of 500 m above the ground .It falls with decreasing acceleration (due to viscous resistance of the air) until at half its original height , it attains its maximum (terminal) speed, and moves with uniform speed thereafter .What is the work done by the gravitational force on the drop in the first and second half of its journey ?What is the work done by the resistive force in the entire journey if its speed on reaching the ground is 1 ms^(-1) ?

    A rain drop of radius 2mm falls from a height of 500 m above the ground. It falls with decreasing acceleration (due to viscous resistance of the air) until at half its original height, it attains its maximum (terminal) speed, and moves with uniform speed thereafter. What is the work done by the gravitational force on the drop in the first and second half of its speed on reaching the ground is 10 ms^(-1) ?

    Two stars bound together by gravity orbit othe because of their mutual attraction. Such a pair of stars is referred to as a binary star system. One type of binary system is that of a black hole and a companion star. The black hole is a star that has cullapsed on itself and is so missive that not even light rays can escape its gravitational pull therefore when describing the relative motion of a black hole and companion star, the motion of the black hole can be assumed negligible compared to that of the companion. The orbit of the companion star is either elliptical with the black hole at one of the foci or circular with the black hole at the centre. The gravitational potential energy is given by U=-GmM//r where G is the universal gravitational constant, m is the mass of the companion star, M is the mass of the black hole, and r is the distance between the centre of the companion star and the centre of the black hole. Since the gravitational force is conservative. The companion star and the centre of the black hole, since the gravitational force is conservative the companion star's total mechanical energy is a constant. Because of the periodic nature of of orbit there is a simple relation between the average kinetic energy ltKgt of the companion star Two special points along the orbit are single out by astronomers. Parigee isthe point at which the companion star is closest to the black hole, and apogee is the point at which is the farthest from the black hole. Q. Which of the following prevents the companion star from leaving its orbit and falling the black hole?

    Home
    Profile