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Shown are several curves (Figure). Explain with reason, which ones amongst them can be possible trajectories traced by a projectile (neglect air friction).

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प्रश्न

Shown are several curves (Figure). Explain with reason, which ones amongst them can be possible trajectories traced by a projectile (neglect air friction).

पर्याय

MCQ
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उत्तर

Explanation:

Here, the trajectory of path which is followed by the projectile under the gravitational force of earth will be a conic section or parabolic or elliptical or focus must be with centre. So, accordingly, only is required which shows centre of earth as focus of trajectory.

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पाठ 8: Gravitation - Exercises [पृष्ठ ६२]

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एनसीईआरटी एक्झांप्लर Physics [English] Class 11
पाठ 8 Gravitation
Exercises | Q 8.31 | पृष्ठ ६२

संबंधित प्रश्‍न

Write the answer of the question with reference to laws of gravitation.

State the universal law of gravitation.


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?


What happens to the force between two objects, if the distance between the objects is doubled and tripled?


What is the importance of the universal law of gravitation?


State and explain Kepler's laws of planetary motion. Draw diagrams to illustrate these laws.


Universal law of gravitation states that every object exerts a gravitational force of attraction on every other object. If this is true, why don’t we notice such forces ? Why don’t the two objects in a room move towards each other due to this force ?


Two concentric spherical shells have masses M1, M2 and radii R1, R2 (R1 < R2). What is the force exerted by this system on a particle of mass m1 if it is placed at a distance (R1+ R2)/2 from the centre?


The gravitational field in a region is given by \[E = \left( 2 \overrightarrow{i} + 3 \overrightarrow{j} \right) N {kg}^{- 1}\] . Show that no work is done by the gravitational field when a particle is moved on the line 3y + 2x = 5.

[Hint : If a line y = mx + c makes angle θ with the X-axis, m = tan θ.]


The law of gravitation gives the gravitational force between :


Explain the following:

People often shake the branches of a tree for getting down its fruits.


Write an expression for the gravitational force of attraction between two bodies of masses m1 and m2 separated by a distance r.


Define one Newton. How much maximum acceleration can it produce in a mass of 1 kg?


Name and state the action and reaction in the following case:
Hammering a nail.


Is there a gravitational attraction between you and the book? Explain.


State Newton's law of gravitation. What is the difference between:
g and G?


To project the rockets which of the following principle(s) is /(are) required?


Law of gravitation gives the gravitational force between


Different points in earth are at slightly different distances from the sun and hence experience different forces due to gravitation. For a rigid body, we know that if various forces act at various points in it, the resultant motion is as if a net force acts on the c.m. (centre of mass) causing translation and a net torque at the c.m. causing rotation around an axis through the c.m. For the earth-sun system (approximating the earth as a uniform density sphere).


Choose the wrong option.


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