Advertisements
Advertisements
Question
A person sitting in a chair in a satellite feels weightless because
Options
the earth does not attract the objects in a satellite
the normal force by the chair on the person balances the earth's attraction
the normal force is zero
the person in satellite is not accelerated.
Advertisements
Solution
the normal force is zero
The gravitational pull on the satellite is used up in providing the necessary centripetal force required for its revolution around the earth. This means that there is no net force on the person sitting in a chair in the satellite. So, the normal reaction of the chair on the person is zero and he will feel weightless.
APPEARS IN
RELATED QUESTIONS
Can you think of two particles which do not exert gravitational force on each other?
Two spherical balls of mass 10 kg each are placed 10 cm apart. Find the gravitational force of attraction between them.
Three uniform spheres each having a mass M and radius a are kept in such a way that each touches the other two. Find the magnitude of the gravitational force on any of the spheres due to the other two.
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?
Multiple Choice Question. Select the correct option.
The mass of earth is 6 × 1024 kg and radius of earth is 6.4 × 106 m. The magnitude of force between the mass of 1 kg and the earth is:
How will the force of gravitation between two objects change if the distance between them is:
Made four times
Where will you weigh more: at the centre of the earth or at the surface of the earth?
What does a force do in the following case?
You catch a kicked ball.
Name and state the action and reaction in the following case:
A book lying on a table.
Name and state the action and reaction in the following case:
A person walking on the ground.
Is there a gravitational attraction between you and the book? Explain.
What do you mean by a gravitational constant?
State Newton's universal law of gravitation. Express it with the mathematical form of force of gravitation?
Particles of masses 2M, m and M are respectively at points A, B and C with AB = ½ (BC). m is much-much smaller than M and at time t = 0, they are all at rest (Figure). At subsequent times before any collision takes place ______.
Give scientific reasons for the following:
Newton's gravitational law is the universal law of gravitation.
Write the answer of the question with reference to laws of gravitation.
Write the value of the universal gravitational constant.
Answer the following questions in reference to the figure below:
- Which relation is shown in the figure?
- What will happen if the mass of one of the objects is doubled?
Two particles of equal mass 'm' go around a circle of radius R under the action of their mutual gravitational attraction. The speed of each particle with respect to its centre of mass is ______.
If the mass of one object is doubled and distance remains the same, the gravitational force will:
