Advertisements
Advertisements
प्रश्न
Write scientific reason.
The value of gravitational acceleration (g) decreases as we go deep inside the earth.
उत्तर
- The acceleration due to gravity (g) on earth’s surface is given as, g = `"GM"/"R"^2`. The value of g depends on the mass M of the earth and the radius R of the earth.
- As we go inside the earth, our distance from the centre of the earth decreases and no longer remains equal to the radius of the earth (R).
- Along-with the distance, the part of the earth which contributes towards the gravitational force felt also decreases, decreasing the value of (M).
- Due to combined result of a change in R and M, value of g decreases as we go deep inside the earth.
APPEARS IN
संबंधित प्रश्न
A stone is released from the top of a tower of height 19.6 m. Calculate its final velocity just before touching the ground.
A stone is thrown vertically upward with an initial velocity of 40 m/s. Taking g = 10 m/s2, find the maximum height reached by the stone. What is the net displacement and the total distance covered by the stone?
A ball thrown up vertically returns to the thrower after 6 s. Find
- the velocity with which it was thrown up,
- the maximum height it reaches, and
- its position after 4 s.
What is the acceleration produced in a freely falling body of mass 10 kg ? (Neglect air resistance)
Give reason for the following :
The force of gravitation between two cricket balls is extremely small but that between a cricket ball and the earth is extremely large.
Explain why, the tip of a sewing needle is sharp.
Name the force which pulled the apple off Isaac Newton’s tree.
An object thrown vertically upwards reaches a height of 500 m. What was its initial velocity? How long will the object take to come back to the earth? Assume g = 10 m/s2
The value of acceleration due to gravity of earth :
A force of 15 N acts on a body of mass 2 kg. Calculate the acceleration produced.
Define the term acceleration due to gravity? Write its S.I. unit.
An object falling freely from rest reaches ground in 2 s. If acceleration due to gravity is 9.8 m s-2, then the velocity of object on reaching the ground will be
In vacuum, all freely falling objects have the same force. Is it true?
Explain why:
Objects fall to the earth.
The value of gravitational acceleration (g) is ________.
Free fall of an object does not depend on the mass of the object.
The mass of planet ‘X” is four times that of the earth and its radius is double the radius of the earth. The escape velocity of a body from the earth is 11.2 × 103 m/s. Find the escape velocity of a body from the planet 'X’.
Distinguish between:
Universal gravitational constant - Gravitational acceleration of earth.
Write a short note.
Escape Velocity
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)
