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

How does a lactometer work ?

Two objects A and B are immersed in water. /the masses of the object are 200kg and 100kg respectively. If the weight of both the objects is 2m3, then --

a) Find the density of A and B

b) Find the ratio of densities of A and B.

c) Find the ratio of relative densities of B and A (B:A)

what are the importance of universal law of gravitation??

A body weighs 600g in air, 450g in water and 480g in a liquid.Then what is the relative density of the solid?

List two factors on which buoyant force depends.

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

^{2}after the applying of force equal to 50000 N. Find the mass of the vehicle.what is the difference between density and relative density of a substance

which force is responsible for the moon revolving around the earth?

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

(a) F1 is very much greater than F2

(b) F2 is very much greater than F1

(c) F1 is only a little greater than F2

(d) F1 and F2 are equal

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

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

Difference between thrust and pressure?

A sharp knife is more effective than a blunt knife.why?

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?

A body weighs 75 g in air ,70.5 g in water and 66 g in liquid.Calculate relative density of liquid

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?

why a truck or a motorbus has wider tyres

(a) Becomes two times (b) Becomes half (c) Does not change (d) Becomes four times

12. If the volume of solid body is reduced to half, then its density

(a) Becomes two time (b) Becomes four times (c) Remains the same (d) becomes half

13. Relative density of a substance depends upon

(a) Mass of the substance

(b) Volume of the substance

(c) Shape of the substance

(d) Material of the substance

An object is dropped from rest at a height of 150 m and simultaneously

another object is dropped from rest at a height 100 m. What is the difference

in their heights after 2 s if both the objects drop with same accelerations?

How does the difference in heights vary with time?

A flower pot drops from the edge of the roof of a multi storied building.Calculate the time taken by the pot cross to a particular distance AB of height 2.9 m , the upper point A being 19.6 m below the roof.

what are the characteristics of gravitational force.......????

What volume of alcohol is displaced by a cork of mass 4.2g which floats in it is how much?

relative density of gold is 19.3.if the density of water is 1000kg/m3 ,what is density of gold in si unit?

radius of an iron sphere is 0.21 cm If density of iron is 7.80g/cc calculate mass

Why does a plastic ball released under water come up to the surface of water?

difference between mass and weight

why do we use constant e.g. K, G etc., to remove proportional sign from the equations?

WHAT IS THE S.I. UNIT OF UPTHRUST?

a body weighs 25 kg on the surface of the earth. if mass od the earth is 6.0*10

^{24}kg, the radius of the earth is 6.4*10^{6}m and the universal gravitational constant is 6.7*10^{-11}Nm^{2}/kg^{2}, calculateplease help fast!!

what is the difference between thrust and force?

a body weighs 30 N on the surface of the earth. how much will it weigh on the surface of the moon?

the acceleration due to gravity on a planet is 1.96m/s

^{2}.If it is safe to jump from a height of 3m on the earth, the corresponding height of the planet will be ?The density of turpentine at 293 K is given as 870 kgm^-3.Identify and write the names of substances that sink in turpentine at the same temperature.

substance density

wood 690

ice 920

rubber 970

paraffin 900

cork 240

bone 1850

How archimedes principle is used to determine the purity of gold?

^{6}.a stone is allowed to fall from the top of a tower 100m high and at the same time another stone is projected vertically upwards frome the ground with a velocity of 25ms-1 . calculate when and where the 2 stones will meet.

A balloon filled with hydrogen gas floats in air. Explain this fact with reason.

When an object is immersed into the fluid two forces act on the object in the vertically opposite directions. Name them and also write the factors on which the magnitude of these forces depends on.

The gravitational force on a body of mass 60 kg is 588 N. If mass of earth is 6 x 10

^{24}kg and radius of earth is 6.4 x 10^{6}m; find the value of GA body weighs 63 N on the surface of the earth. What is the gravitational force exerted on it due to the earth at a height equal to half the radius of the earth?

1. Explain why a balloon filled with helium gas rises in air. Why does the balloon rise to a particular height above ground and does not rise further ?

Name two substances whose density cannot be measured.

why pieces of bursting cracker fall in all possible directions?

1) State Archimedes principle?

2) Give two applications of archimedes principle.

Explain why the pin causes more pain in man's thumb than in his finger

A solid weighs 80g in air, 68g in water and 60g in oil. Calculate the relative density of oil and solid.

difference between g and G .

which has more inertia man oR a child? give reasons for your answer.

how is the least count and the zero error of the spring balance is calculated?

name the factors affecting pressure

A cube of copper was found to have a mass of 0.630kg. What are the dimensions of the cube?(The density of copper is 8.94g/cm

^{3}).State the laws of floatation.

^{-2})prove that if a body is thrown vertically upwards, the time of ascent is equal to the time of decent.

Q1 Give reasons:

1)In the figure the card is flicked with a push?

a)What do you observe in above case ? and why?

b)State the law involed in this case.

c)What will be your observation if the above coin is replaced by a heavy five rupee coin.

Justify your answer.

Define one pascal.

state one important effect produced by the buoyant force exerted by water.

At what height above the earth's surface would the value of acceleration due to gravity be half of what it is on the surface? Calculate.

The moon is acted by gravitational pull on earth , still it does not fall on the earth. Explain why ? Determine the ratio of weight of an object of mass 50 kg on earth and on moon.(thake gearth = 10 m per second square ) ( gearth = 6gmoon )

A piece of iron of density 7.8 * 103kg/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

(c) Apparent weight in water

A stone is thrown vertically upward with a velocity 40m/s and is caught back. Taking g=10m/s2.calculate the maximum height reached by the stone

what are the applications of archimedes principle???

less than 4 feet on the surface of the moon.

write the factor on which pressure depends

If th relative density of a substance is greater than 1. What does it signify?

RELATIONSHIP BETWEEN SMALL g AND CAPITAL G

A sphere of mass 40 kg is attraced by a second sphere of mass 15 kg when their centers are 20 cm apart, with a force of 0.1 milligram weight. Calculate the value of gravitational constant.

how to make model of lactometer on archimedes principle

why does buildings have wide foundations?

[b] thrust

[c] pressure

[d] none of these

prove that if a body is thrown vertically upward , the time of ascent is equal to the time of descent.

By applying a force of 1N, approx. what mass of body can a person hold?

the density of ice is 0.9 g/cm

^{3}. When it floats in water, what fraction of its volume will remain above surface?a fish weighs less in water than in air.why?

^{-4}m^{3}is completely immersed in water.the buoyant force exerted by water on the sphere is _______.(take g=9.8 m/s

^{2}, density of water=1000 kg/m

^{3})loaded test tube placed in pure milk sinks to a certain mark (M). Now some water is mixed with the milk. Will the test tube sink more or less? Explain.

A Piece of ice is placed gently on the surface of water in a glass so that when ice floats, the water comes up to the brim of the glass. what will happen to the level of water when the ice melts? will it overflow? (2) in the above case what will happen if instead of water the glass is filled with (a) with a liquid denser than water. (b) a liquid lighter than water.