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Syllabus

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

^{-2})what are the importance of universal law of gravitation??

Look at the diagrams below.

A sheet of paper and a crumpled paper are thrown down from the same height and time is noted. Answer the following questions.

(a) Will the time taken to reach the bottom of the container be the same for the sheet of paper and crumpled paper ? Why ? Explain giving reason.

(b) What will happen in case (ii) ?

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 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 density and relative density of a substance

A person weighs 110.84N on moon whose acceleration due to gravity is 1/6 of that earth.if the value of 'g' on earth is 9.8m/s-2(ms-2) calculate

a) 'g' on moon

b) mass of person on moon

c) weight of person on earth

2) how does the value of 'g' on the earth is related to the mass of the earth and its radius?derive it?

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

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

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

explain why the value of g changes from poles to equator on the surface of the earth. state how its value changed on moving:

1) towards the centre of the earth

2)away from the earth?

Difference between thrust and pressure?

A cylindrical block of radius

"r"and mass"m"is lying on the table. If its radius isdoubledand mass istripledthen what happens to pressure acting on the table.??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.

Find the percentage change in the weight of a body when it is taken fom equator to poles. the polar radius is 6,357 Km and equatorial radius is 6,378 Km.

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 man weighs 600 N on the earth. What is his mass? If he were taken to the moon, his weight would be 100N. What is his mass on the moon? What is the acceleration due to gravity on the moon? (60kg, 60kg, 1.66m/s

^{2})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?

(a) is same on equator and poles

(b) is least on poles

(c) is least on equator

(d) increases from pole to equator

Why Newton's law of gravitation called universal law

a boy drops a coin from the top of a tower 50 m high. find the time taken by the coin to reach the ground.

why a truck or a motorbus has wider tyres

a body of mass 25kg is raised to the top of a building 10m high and then dropped freely under gravity (g= 10m/s

^{2})a) calculate the work done in raising the body to the top of the building.

b) what is the value of the gravitational potential energy at the top of the building.

c) by what factor will the gravitational potential energy of the same body increase if it is raised to the top of a multistorey building of 30m high

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?

two bodies of mass 1 kg and 100 kg respectively are dropped simultaneously fron same height 4.9 m in vacuum. Calculate and comapre their final velocities just before hitting the ground and the time interval in which they will hit the ground (g= 9.8m/s

^{2})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

what is the weight of an object of mass 10 kg on moon and on earth? What is the relation between value of 'g' on earth and on moon? (Take value of 'g' on earth to be = 9.8 m s

^{-2})which is greater the attraction of earth for 1 kg iron or the attraction of 1 kg iron for earth(reason pls)

difference between mass and weight

WHAT IS THE S.I. UNIT OF UPTHRUST?

what is the difference between thrust and force?

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 ?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 ?

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

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.

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?

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 )

Name two substances whose density cannot be measured.

(a) will continue to move in the circular path

(b) will move along a straight line towards the centre of the circular path

(c) will move along a straight line tangential to the circular path

(d) will move along a straight line perpendicular to the circular path away from the boy

1) State Archimedes principle?

2) Give two applications of archimedes principle.

a cylindrical block of radius r and mass m is lying on the table. if the radius is doubled and mass is tripled then what happens to pressure acting on the table

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 .

time of throwing.

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

^{2})name the factors affecting pressure

State the laws of floatation.

"a ball is thrown up with a speed of 15m/s how high will it go before it beigeings to fall g[9.8]m/s"

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

Q1 Give reasons:

"Several phenomenon of celestial bodies were believed to be unconnected but universal law of gravitation was succesful to explain them." Mention any two phenomena.

Define one pascal.

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.

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

less than 4 feet on the surface of the moon.

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

(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 are the applications of archimedes principle???

a student lifts an object in the upward direction.in doing so he applies force on the object in the upward direction and displaces it in that direction.(however , the force of gravity is also acting on the object?

write the factor on which pressure depends

^{2}^{ }. suppose earth suddenly shrinks to 1/3 of its size without losing mass. What is the value of g on the surface of earth.RELATIONSHIP BETWEEN SMALL g AND CAPITAL G

During Freefall, what is the weight of a body? Give reason for your answer.

how to make model of lactometer on archimedes principle

why does buildings have wide foundations?

In example 10.1-gravitation.i am not getting the correct answer.could you please explain it to me.the complete steps are not given in the textbook.

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

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

the density of ice is 0.9 g/cm

^{3}. When it floats in water, what fraction of its volume will remain above surface?THE RATIO OF THE GRAVITATIONAL FORCE ON NEPTUNE TO THE GRAVITATIONAL FORCE ON EARTH IS 9:8. RAMESH WEIGHS 792N ON EARTH. CALCULATE HIS WEIGHT ON NEPTUNE?

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.

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.

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