Gravitational Force

Q. State the universal law of gravitation.

Q.

State and explain newtons law of gravitation.

Q.

Why is the value of g greater at the pole?

Q.

Moon has no atmosphere because

1. It is far away from the surface of the earth

2. Its surface temperature is 10⁰C

3. the RMS velocity of all the gas molecules is more than the escape velocity of the moons surface

4. the escape velocity of the moons surface is more than the RMS velocity of all molecules

Q.

The relation between g and G is______________

Q.

The capacitance of a spherical condenser is $1\mu F$. If the spacing between the two spheres is $1mm$, then the radius of the outer sphere is

1. $30cm$

2. $6m$

3. $5cm$

4. $3m$

Q.

What is gravitational force?

Q.

What is the working principle of a ballpoint pen?

Q. State Newton's law of universal gravitation.

Q.

What are dimensional constants?

Q.

Two identical particles each of mass $M$ and charge $Q$ are placed a certain distance part. If they are in equilibrium under mutual gravitational and electric force, then calculate the ratio of ​$\frac{Q}{M}$ in SI units.

Q. Why? $G=g{m}^1\frac{m^2}{r^2}$

Q. Choose the correct options regarding the strength of gravitational force.

1. Gravitational force is approximately ${10}^{-38}$ times the strength of the nuclear force
2. Gravitational force has negligible influence when considered on an atomic scale
3. All of the above.
4. Gravitational force is the weakest amongst all the fundamental forces of nature

Q.

Define 1 kgf. How is it related to the S.I unit of force?

Q.

Which is the strongest force in nature?

Q.

If suddenly the gravitational force of attraction between the earth and a satellite revolving around it becomes zero, then the satellite will

1. continue to move in its orbit with the same velocity

2. move tangentially to the original orbit with the same velocity

3. become stationary in its orbit

4. move towards the earth

Q. Question 10
Amit buys few grams of gold at the poles as per the instruction of one of his friends. He hands over the same when he meets him at the equator. Will the friend agree with the weight of gold bought? If not, why? [Hint: The value of g is greater at the poles than at the equator].

Q.

Calculate the mass of an object whose weight is 98 newton?

Q.

Gravitational force is proportional to the product of the_____ and inversely proportional to the square of _____ between two bodies.

1. distance, masses

2. masses, distance

3. weights, displacement

4. None of these

Q.

Two particles of equal mass $m$ and charge $q$ are placed at a distance of $16\mathrm{cm}$. They do not experience any force. The value of $\frac{q}{m}$ is:

Q.

What force is responsible for the earth revolving round the sun?

Q. The earth is acted upon by gravitational force of attraction due to the sun. Then why does the earth not fall towards the sun?

Q.

When an object is dropped from a height, it accelerates and falls down. Name the force which accelerates the object.

Q.

What are gravitons?

Q.

Explain why, if a stone held in our hand is released, it falls towards the earth.

Q.

Is the rotation of the earth around a fixed axis an example of circular motion?

Q.

Which of the following instruments are used for measuring mass?

1. 4.89 %

2. 1.26 %

3. 9.67 %

4. 15.56 %

Q.

An astronaut is in a stable orbit around the earth when he weighs a body of mass $5kg$. What is the reading of spring balance?

1. Spring will not be extended

2. Spring will be extended according to Hooke’s law

3. Less than $5kg-wt$

4. More than $5kg-wt$

Q.

The force of attraction between two bodies is 20N Calculate the force between them when mass of each body as well as distance between them is halved ?

Q.

What type of force is involved. in the formation of tides in the sea ?