Advertisements
Advertisements
प्रश्न
When is free fall possible?
Advertisements
उत्तर
Free fall is only conceivable in the absence of air or vacuum. When a ball and a feather are thrown from a height, the ball falls to the ground first. In a vacuum, both the ball and the feather will end up on the ground.
APPEARS IN
संबंधित प्रश्न
Which force is responsible for the moon revolving round the earth ?
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, if a stone held in our hand is released, it falls towards the earth.
Name the force which wears away two surfaces as they move over one another.
A stone is thrown vertically upwards with initial velocity u reaches a height ‘h’ before coming down. Show that the time taken to go up is the same as the time taken to come down.
A metal ball of mass 5 kg falls from a height of 490 m. How much time it will take to reach the ground? (g = 9.8 m/s2)
Define the term acceleration due to gravity? Write its S.I. unit.
A body falls freely under gravity from rest and reaches the ground in time t. Write the expression for the height fallen by the body.
What is the acceleration due to gravity?
What is escape velocity?
State whether the below statement is True or False.
Neglecting air resistance, a body falling freely near the earth's surface has a constant acceleration.
Explain why:
Objects fall to the earth.
What do you understand by the free fall?
The value of gravitational acceleration (g) is ________.
The free fall of an object is possible only in _______.
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)
