what is the difference between density and relative density ?

Why Newton's law of gravitation called universal law

How does a lactometer work ?

what are the importance of universal law of gravitation??

List two factors on which buoyant force depends.

WHEN A PLANET MOVES AROUND THE SUN, ITS (A) AREAL VELOCITY IS CONSTANT (B) LINEAR VELOCITY IS CONSTANT

(C) ANGULAR VELOCITY IS CONSTANT (D) ALL THE VELOCITIES ARE CONSTANT

what happens to the gravitational force between two objects if

i) the mass of one object is doubled

ii) distance between two objects is doubled

iii) masses of both the objects are doubled

A coin sinks when placed on the surface of water.Give reasons.

what is the difference between density and relative density of a substance

Why do objects float or sink when placed on the surface of liquid?

what is the relationship between "G" and "g"?

Difference between thrust and pressure?

A ball thrown up vertically returns to the thrower after 6 s. Find

(a) the velocity with which it was thrown up,

(b) the maximum height it reaches, and

(c) its position after 4 s.

A solid weighs 80g in air and 64g in water. Calculate its relative density. Also tell, when kept in water would the object float or sink.

What happens to the force between two objects, if

(i) the mass of one object is doubled?

(ii) the distance between the objects is doubled and tripled?

(iii) the masses of both objects are doubled?

Guys, it's urgent, plz answer them immediately...

Q1. A block weighing 1.0 kg is in the shape of a cube of length 10 cm. It is kept on a horizontal table. Find the pressure on the portion of the table where the block is kept. (ans. 1000Pa)

the mass of an object is 60 kg on the surface of the earth. What would be its weight when measured on the surfce of the moon ? what would be its mass on the moon ? (take g = 10m/s^{2}

acceleration due to gravity for a nearly spherical planet is directly proportional to distance from its centre for a point inside it. True or False?

why a truck or a motorbus has wider tyres

how can we identify whether a substance is pure or not by knowing its density ?

what is the difference between density and relative density ?Why Newton's law of gravitation called universal law

How does a lactometer work ?

what are the importance of universal law of gravitation??

List two factors on which buoyant force depends.

WHEN A PLANET MOVES AROUND THE SUN, ITS

(A) AREAL VELOCITY IS CONSTANT

(B) LINEAR VELOCITY IS CONSTANT

(C) ANGULAR VELOCITY IS CONSTANT

(D) ALL THE VELOCITIES ARE CONSTANT

what happens to the gravitational force between two objects if

i) the mass of one object is doubled

ii) distance between two objects is doubled

iii) masses of both the objects are doubled

A coin sinks when placed on the surface of water.Give reasons.

what is the difference between density and relative density of a substance

Why do objects float or sink when placed on the surface of liquid?

what is the relationship between "G" and "g"?

for class 9 fast for revision

Difference between thrust and pressure?

A ball thrown up vertically returns to the thrower after 6 s. Find

(a) the velocity with which it was thrown up,

(b) the maximum height it reaches, and

(c) its position after 4 s.

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R2

A solid weighs 80g in air and 64g in water. Calculate its relative density. Also tell, when kept in water would the object float or sink.

What happens to the force between two objects, if

(i) the mass of one object is doubled?

(ii) the distance between the objects is doubled and tripled?

(iii) the masses of both objects are doubled?

(b) when a stone is thrown vertically upward its velocity continuously discarded. why?

(c) give an example of a motion in which average velocity is zero, but average speed is not zero.

Guys, it's urgent, plz answer them immediately...

Q1. A block weighing 1.0 kg is in the shape of a cube of length 10 cm. It is kept on a horizontal table. Find the pressure on the portion of the table where the block is kept. (ans. 1000Pa)

^{2}and atmospheric pressure (1atm) =1.013×10^{5}Pa.^{}(ans.15.2 ton wt)Q3. Calculate the mass of a body whose volume is 2 m

^{3}and density 0.52 g/cm^{3}. (ans. 1040 kg)Q4. A dining hall has dimensions 50m× 15m × 3.5m. Calculate the mass of air in the hall. Given, density of air =1.30kg/m

^{3}. (ans. 3412.5 kg)Q5. A thread of mercury of 10.2 g is in a tube of uniform cross section 0.1cm

^{3}. Calculate the length of thread. The density of mercury is 13.6g/cm^{3}. (ans. 7.5cm)Q6. A cubical block of water is dipped completely in water. Each edge of the block is 1cm in length. Find the buoyant force acting on the block. (ans. 10

^{-2}N)Q7. A body of mass 2.0 kg and density 8000 kg/m

^{3}is completely dipped in a liquid of density 800 kg/m^{3}. Find the force of buoyancy on it. (ans. 2N)Q8. A piece of iron of density 7.8 × 10

^{3}kg/m^{3}and volume 100 cm^{3}is totally immersed in water. Calculate (a) the weight of the iron piece in air (b) the upthrust and (c) apparent weight in water. (ans. (a) 7.8N (b) 1N (c) 6.8 N)Q9. A solid body of mass 150g and volume 250cm

^{3}is put in water. Will the body float or sink.Q10. A solid of density 5000kg/m

^{3}weights 0.5 kg in air. It is completely immersed in water of density 1000kg/m^{3}.^{3}? (ans. 0)Q11. The mass of a block made of certain material is 13.5 kg and its volume is 15 × 10

^{-3}m^{3}. Will the block float or sink in water. Give reason for your answer.Q12. (a) What is the density of air in NTP? (b)What is the unit of relative density?

Q13. (a) When does a body sinks in a fluid?

(b)Why does a balloon filled with hydrogen gas rise up against gravity?

Q15. (a). A body weighs 10 N in air and 8 N when fully immersed in water. How much is the buoyant force acting on the body?

the mass of an object is 60 kg on the surface of the earth. What would be its weight when measured on the surfce of the moon ? what would be its mass on the moon ? (take g = 10m/s

^{2}acceleration due to gravity for a nearly spherical planet is directly proportional to distance from its centre for a point inside it. True or False?

why a truck or a motorbus has wider tyres

how can we identify whether a substance is pure or not by knowing its density ?