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what is the difference between density and relative density ?How does a lactometer work ?

the density of ice is 0.9 g/cm

^{3}. When it floats in water, what fraction of its volume will remain above surface?what are the importance of universal law of gravitation??

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 ?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

(A) l decreases

(B) l increases

(C) h decreases

(D) h increases

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

A silver ornament is suspected to be hollow. Its weight is 250 gms and it displaces 50 cm3 of water. If the density of silver is 10 g/cm

^{3}find the volume of the cavity.Why do objects float or sink when placed on the surface of liquid?

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

Why Newton's law of gravitation called universal law

Difference between thrust and pressure?

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 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 tank 5m high is half filled with water and then is filled to the top with oil of density 0.85 g/cm

^{3}. The pressure at the bottom of the bottom of the tank, due to these liquids isa)1.85 dyne/cm

^{2}b)89.25 dyne/cm^{2}c)462.5 dyne/cm^{2}d)500 dyne/cm^{2}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.

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

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?

The radius of the earth is about 6400 km and that of mars is about 3200 km . The mass of the earth is about 10 times the mass of mars. If an object weigh 200 Newton on earth's surface , then wht will be it's surface on the mars?

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

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

difference between mass and weight

what is the difference between thrust and force?

^{3}and that of seawater is 1030 Kg/m^{3}. An iceberg floats with a portion 224 litres outside water. Find the volume iceberg?How archimedes principle is used to determine the purity of gold?

Find pressure when a thrust of 20 N is applied on a surface area of 10cm

^{2}WHAT IS THE S.I. UNIT OF UPTHRUST?

^{2 ,}density of water= 1000 kg/m^{3})a) 0.1 mm b) 1 m c) 1 mm d) 0.1 m please explain answer in detail.

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.

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.

two bodies are equilibrium when suspended in water from the arm of a balance.the mass of one body is 36g and its density is 9g/cm

^{3}if the mass of the otheris 48g.what is its density

Name two substances whose density cannot be measured.

a. more than 40 kg.

b.less than 40 kg

c.40kg

d.zero

A 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?

a weightless balloon contains 200g of water. its weight in water will be

a)100g

b)200g

c)400g

d)zero

Q). In a hydraulic lift, used at a service station the radius of the large and small piston are in the ratio of 20 : 1. What weight placed on the small piston will be sufficient to lift a car of mass 1500 kg?

1) State Archimedes principle?

2) Give two applications of archimedes principle.

difference between g and G .

What is the source of centripetal force that a planet requires to revolve around the Sun? On what factors does that force depend?

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

If 100 cc iron of relative density 7.8 floats on Mercury of relative density 13.6 .what volume of iron is immersed

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

Pressure exerted in any confined mass of fluid is transmitted undiminished in all directions... What does this mean.?

name the factors affecting pressure

The period of revolution of a certain planet in an orbit of radius R is T. Its period of revolution in an orbit of radius 4R will be?

State the laws of floatation.

^{3}at the rate of 0.35 cm/sec.Coefficient of viscosity of the solution is:(Assume the mass of the bubble to be negligible)

A) 9 poise

B)6 poise

C)11 poise

D) 4 poise

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

Define one pascal.

^{3}.The density of air is 1.26 Kg/m^{3}.Calculatea) the weight it can lift

b) the acceleration as it rises

Q1 Give reasons:

a. the pressure of the gas in the cylinder and

b. the pressure of mercury at the bottom of the U tube.

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.

^{3}.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

the cube is 2 cm above water level. What is the measurement of its one side?

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

write the factor on which pressure depends

The mass of a density bottle is 25g when empty , 50g when filled completely with water 365g when filled completely with mercury. Find the density of mercury.

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RELATIONSHIP BETWEEN SMALL g AND CAPITAL G

^{24 }kg, Radius of earth = 6.4 x 10^{3}km and G= 6.7 x 10^{-11}Nm^{2 }kg^{-2}.what are the applications of archimedes principle???

a solid shell lose half of its weight in water .if relative density of shell is 5 ,what fraction of its volume is hollow?

how to make model of lactometer on archimedes principle

1) tan

^{-1}[ GM / gL ] 2) tan^{-1}[ GM / 2gL ] 3) tan^{-1}[ GM / gL^{2}] 4) tan^{-1}[ 2GM / gL^{2}]why does buildings have wide foundations?

(i) the surface 50 cm * 25 cm is placed

(ii) the surface 25 cm * 10 cm is placed

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

A column of water 0.60m supports a 0.32m column of an unknown liquid. whatis the density of the liquid?

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.

A) 40 kg

B) Less than 40 kg

C) More than 40 kg

D) Zero

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.

The weight of a body in air is 100N. How much will it weigh in water if it displaces 400cm

^{3}of water?A cube of side 5cm is immersed in water and then in saturated salt solution. In

a solid object has a weight of 5N. when submerged in water, it weighs 3.5N. find the density of object. density of water is 1*10

^{3}kg/m^{3}., acc. due to gravity is 9.8m/s^{2}