Question 1 :
The motion of the moon around the earth is due to the _____________.
Question 2 :
Two particles are placed at some distance. If the mass of each of the two particles is doubled, keeping the distance between them unchanged, the value of gravitational force between them will be ___ .
Question 3 :
A stone is released from the top of a tower of height 19.6 m.What is its final velocity just before touching the ground?
Question 4 :
A stone is allowed to fall from the top of a tower 100 m high and at the same time another stone is projected vertically upwards from the ground with a velocity of 25 m/s. When and where the two stones will meet ?
Question 5 :
A stone is thrown vertically upward with an initial velocity of 40 m/s. Taking g = 10 $m/s^2$, What is the maximum height reached by the stone?
Question 6 :
What is the average density of the earth in terms of g, G and R?
Question 9 :
The mass of an object is constant and does not change from place to place.
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?
Question 12 :
The weight of an object at the centre of the earth of radius R is ______.
Question 13 :
A car falls off a ledge and drops to the ground in 0.5 s. Let $g = 10 \ m s^{–2}$ (for simplifying the calculations).How high is the ledge from the ground?
Question 14 :
The weight of an object is constant and does not change from place to place.
Question 15 :
It is seen that a falling apple is attracted towards the earth. Does the apple attract the earth?
Question 16 :
Relative density of silver is 10.8. The density of water is $10^3 \ kg/m^{3}$. What is the density of silver in SI unit?
Question 17 :
If the moon attracts the earth, Does the earth not move towards the moon?
Question 18 :
What do we call the gravitational force between the earth and an object?
Question 19 :
A ball is thrown vertically upwards with a velocity of 49 m/s.What is the total time it takes to return to the surface of the earth?
Question 20 :
What happens to the force between two objects, if the masses of both objects are doubled?
Question 21 :
The upward force exerted by the water on the bottle is known as-
Question 24 :
A ball weighing 4 kg of density $4000 kg m^{-3}$ is completely immersed in water of density $10^{3} kg m^{-3}$ Find the force of buoyancy on it. (Given $g = 10 m s^{-2}$)
Question 25 :
The density of cork is ________ than the density of water
Question 26 :
What happens to the force between two objects, if the mass of one object is doubled?
Question 27 :
What happens to the force between two objects, if the masses of both objects are doubled?
Question 28 :
In the relation $F =\frac{ G M m}{d^2}$, the quantity G _____.
Question 29 :
A block of wood is kept on a tabletop. The mass of wooden block is 5 kg and its dimensions are $40 cm \times 20 cm \times 10 cm$. What is the pressure exerted by the wooden block on the table top if it is made to lie on the table top with its sides of dimensions $40 cm \times 20 cm$?
Question 30 :
A stone is thrown vertically upward with an initial velocity of 40 m/s. Taking g = 10 $m/s^2$,What is the net displacement and the total distance covered by the stone?
Question 31 :
An object is put one by one in three liquids having different densities. The object floats with $\frac{1}{9} , \frac{2}{11} and \frac{3}{7} $parts of their volumes outside the liquid surface in liquids of densities $d_1, d_2 , d_3 $ respectively. Which of the following statement is correct?
Question 32 :
What is the force of gravitation between the earth and the Sun, given that the mass of the$ earth = 6\times10^{24}$ kg and of the $Sun = 2\times10^{30}$ kg. The average distance between the two is $1.5\times10^{11}$ m.
Question 33 :
A car falls off a ledge and drops to the ground in 0.5 s. Let $g = 10 \ m s^{–2}$ (for simplifying the calculations).What is its speed on striking the ground?
Question 34 :
The density of an iron nail is _______ than the density of water
Question 35 :
A ball is thrown vertically upwards with a velocity of 49m/s. Calculate the total time it takes to return to the surface of the Earth.
