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I) If G = Gm/R2 Then Where Will the Value of G Be High at Goa Beach Or on Top of Mount Everest? - Science and Technology 1

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प्रश्न

i) If g = GM/r2 then where will the value of g be high at Goa Beach or on top of Mount Everest? 

उत्तर

Goa beach.

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

संबंधित प्रश्न

What do you mean by free fall?


What do you mean by acceleration due to gravity?


Which force is responsible for the moon revolving round the earth ?


State whether the following statement is true or false :
A falling stone also attracts the earth.


State whether the following statement is true or false :

The acceleration due to gravity acting on a freely falling body is directly proportional to the mass of the body.


What is the force of gravity on a body of mass 150 kg lying on the surface of the earth? (Mass of earth = 6 x 1024 kg; Radius of earth = 6.4 x 106 m; G = 6.7 x 10-11 Nm2/kg2)


What is the usual value of the acceleration due to gravity of earth ?


Explain why, the tip of a sewing needle is sharp.


Name the force which wears away two surfaces as they move over one another.


Solve the problem.

If the mass of a planet is eight times the mass of the Earth and its radius is twice the radius of the Earth, what will be the escape velocity for that planet?


What would be the value of ‘g’ on the surface of the earth if its mass was twice and its radius half of what it is now?


The total energy of an object falling freely towards the ground ______.


The acceleration produced in a body by a force of given magnitude depends on


A car is moving with a uniform velocity 30 ms-1. It is stopped in 2 s by applying a force of 1500 N through its brakes. Calculate the following values :  The retardation produced in car.


The value of gravitational acceleration at the centre of earth is zero.


Write scientific reason.

The value of gravitational acceleration (g) is taken to be -g when studying the motion of an object thrown upwards in a straight line.


The mass and weight of an object on earth are 5 kg and 49 N respectively. What will be their values on the moon? Assume that the acceleration due to gravity on the moon is 1/6th of that on the earth.


Read the given passage carefully and answer the questions.

We know that the force of gravity due to the earth acts on each and every object. When we were holding the stone in our hand, the stone was experiencing this force, but it was balanced by a force that we were applying on it in the opposite direction. As a result, the stone remained at rest. Once we release the stone from our hands, the only force that acts on it is the gravitational force of the earth and the stone falls down under its influence. Whenever an object moves under the influence of the force of gravity alone, it is said to be falling freely. Thus the released stone is in a free fall. In free fall, the initial velocity of the object is zero and goes on increasing due to the acceleration due to the gravity of the earth. During free fall, the frictional force due to air opposes the motion of the object and a buoyant force also acts on the object. Thus, true free fall is possible only in a vacuum.

1) Complete the following statement by choosing the right option.

The stone held in the hand is stable because on it __.

  1. two unbalanced forces are exerted.
  2. only the gravitational force of the earth is exerted.
  3. gravitational force of the earth is not exerted.
  4. two balanced forces are exerted.

2) Why does free fall not happen on the earth?

3) Why does the velocity of the object increase during the free fall?

4) Which type of force exerts on the object during free fall?

5) Why does free fall happen only in a vacuum?


Calculate the escape velocity on the surface of the moon given the mass and radius of the moon to be 7.34 × 1022 kg and 1.74 × 106 m respectively.

(Given: G = 6.67 × 10-11 Nm2/kg2)


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