Advertisements
Advertisements
Question
Give scientific reasons.
Any object on earth falls vertically downward and not at an angle to the vertical; nor fly off in a horizontal direction.
Solution
The centre of the earth receives the force that pulls all objects toward it. Therefore, the direction from the falling object to the centre of the earth is vertically downward at any place.
APPEARS IN
RELATED QUESTIONS
Name the scientist who gave the three laws of planetary motion.
Name the scientist who explained the motion of planets on the basis of gravitational force between the sun and planets.
What type of force is involved in the formation of tides in the sea ?
A coin and a piece of paper are dropped simultaneously from the same height. Which of the two will touch the ground first ? What will happen if the coin and the piece of paper are dropped in vacuum ? Give reasons for your answer.
What is the actual shape of the orbit of a planet around the sun? What assumption was made by Newton regarding the shape of an orbit of a planet around the sun of deriving his inverse square rule from Kepler's third law of planetary motion?
The masses of the earth and moon are 6 × 1024 kg and 7.4 × 1022 kg, respectively. The distance between them is 3.8 × 105 km. Calculate the gravitational force of attraction between the two?
Use G = 6.7 × 10–11 N m2 kg–2
The mass of the earth is 6 × 1024 kg. The distance between the earth and the sun is 1.5 × 1011 m. If the gravitational force between the two is 3.5 × 1022 N, what is the mass of the sun? Use G = 6.7 × 10–11 N m2 kg–2
Describe how the gravitational force between two objects depends on the distance between them.
An object is thrown vertically upwards with a velocity u, the greatest height h to which it will rise before falling back is given by :
The atmosphere consisting of a large number of gases is held to the earth by :
The value of acceleration due to gravity
The gravitational force between two objects is F. If masses of both objects are halved without changing distance between them, then the gravitational force would become
A boy is whirling a stone tied with a string in a horizontal circular path. If the string breaks, the stone
The atmosphere is held to the earth by
Identical packets are dropped from two aeroplanes, one above the equator and the other above the north pole, both at height h. Assuming all conditions are identical, will those packets take some time to reach the surface of the earth. Justify your answer.
The earth is acted upon by the gravitation of the Sun, even though it does not fall into the Sun. Why?