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Syllabus

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

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) ?

what are the importance of universal law of gravitation??

^{-2})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 boy drops a coin from the top of a tower 50 m high. find the time taken by the coin to reach the ground.

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"?

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 GDifference between thrust and pressure?

(a) what according to you are the values shown by manish's teacher

(b) how will you explain this concept to solve manish's doubt

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.

In what source is G universal?

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?

mass of Jupiter 2*10^7kg.

mass of saturn is 6*10^26kg.

distance from Jupiter from earth 6.3*10^11 m.

distance of saturn from earth is 1.28*10^12m.

G =6.67*10^-11.

acceleration due to gravity 9.8m/sec.

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?

Can we say that it is universal in law of gravitation

Why Newton's law of gravitation called universal law

What keeps the moon in uniform circular motion around the earth?

why a truck or a motorbus has wider tyres

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?

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

Explain the reason.

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

A body weighs 1 kg on the surface of the moon.If the mass of the moon is 7.4*10 power 22 kg,the radius pf moon is 1740 km and the gravitational constant 6.67*10 power -11 Nm power 2 *kg power -2,calculate a) the force acting on the i)body ii)moon b)the acceleration produced in the object c)the acceleration produced in the moon

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

an object weighs 294N on the earth. what would be its mass on the moon .what is the acceleration due to gravity on the moon

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

find the distance between two stones each of mass 2 kg so that the gravitational force between them is 1n.

difference between mass and weight

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 S.I. UNIT OF UPTHRUST?

gravitational force on an object on an imaginary planet is half of that of the gravitational force on same body on earth. Find:

(i) the vallue of acceleration due to gravity on this planet and

(ii) wieht of an object of mass 50kg on that planet [ take 'g' earth= 10m/s^2]

what is the difference between thrust and force?

a stone is dropped from the edge of a roof. find the distance travelled by the stone in 2 s after the stone was released.

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 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 )

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.

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.

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 mass of a body is 40 kg. find the weight of the body on the surface of a planet whose mass is double than the mass of the earth and radius is 4 times the radius of earth.

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?

Q.1 The gravitational force between two objects is 200N. How should the distance between the objects be changed so that force between them becomes 100N ?

Q. 2 What happens to the force of gravitation between two bodies if the distance between the bodies is tripled ?

Name two substances whose density cannot be measured.

why is it difficult to hold a school bag having a strap made of thin & strong strip?

1) State Archimedes principle?

2) Give two applications of archimedes principle.

How will the weigth of a body of mass 100g change if it taken from the eqautor to the poles?

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 .

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

When does an object show weightlessness?

name the factors affecting pressure

State any four natural phenomenon explained by the Universal Law of Gravitation. The best answer will get a like

State the laws of floatation.

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

weight of an object will be lesser or more at antarctica as compared to the weight of object at delhi . give reason for your ans.

Q1 Give reasons:

Define one pascal.

A stone is dropped from a height of 10m on an unknown planet having g=20m/s. calculate the speed of the stone when it hits the surface of the planrt. also calculate the time it takes to fall through the height.

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

A body weighs 30 kg on earth . Given that mass of earth is 6 x 10

^{29}kg , its radius is 6.4 x 10^{6}m , G = 6.7 x 10^{--11}Nm^{2}kg^{--2}. what will be :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???

(a) 9.8 N

(b) 19.6 N

(c) 6.67 x 10?11 N

(d) 2 x 6.67 x 10?11 N

write the factor on which pressure depends

RELATIONSHIP BETWEEN SMALL g AND CAPITAL G

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

how to make model of lactometer on archimedes principle

1) A solid exerts pressure of 20 Pa on a surface of 2m

^{2}.Find its weight.2) Relative density of an object is 1.35. Will it float or sink in water?

why does buildings have wide foundations?

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

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 ?

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 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.