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Syllabus

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

Why Newton's law of gravitation called universal law

what are the importance of universal law of gravitation??

^{-2})List two factors on which buoyant force depends.

(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 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

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

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

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"?

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!!

Difference between thrust and pressure?

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?

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 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})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?

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

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

^{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.why a truck or a motorbus has wider tyres

1) Consider a heavenly body which has a mass twice that of the Earth and radius thrice that of the Earth. What will be the weight of the book on this heavenly body , if its weight on Earth is 900 N ?

2) Why gravitational force is usually unnoticeable ?

3) Prove that acceleartion due to gravity is independent of mass of the body.

4) How can the average density of the Earth can be determined ?

5) Buoyancy depends on which factors ?

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.......????

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

A force produces an acceleration of 5 cm/s squared when it acyts on a body of mass 20 g. Find the force acting on the body.

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

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 ?^{-2})difference between mass and weight

WHAT IS THE S.I. UNIT OF UPTHRUST?

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?

what is the difference between thrust and force?

Q. The water level in the measuring cylinder before and after immersing a metal cube is shown in the figure. Calculate the volume of the metal cube.

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.

Show that weight of an object on moon is 1/6 of its weight on earth.(given :mass of earth = 5.98 * 10 raised to 24 kg,mass of moon 7.36 *10 raised to 22 kg radius of earth 6.37 * 10 raised to 6m radius of the moon 1.74 * 10 raised to 6m

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?

Name two substances whose density cannot be measured.

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

1) State Archimedes principle?

2) Give two applications of archimedes principle.

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?

name the factors affecting pressure

State universal law of gravitation.The gravitational force between two objects is 100N.How should the distance between the objects be changed so that the force between them becomes 50N.

State the laws of floatation.

^{3}kg/m^{3}) on the bottom surface of tank having dimensions 2m long, 4m broad, 2m deep is^{5}Pa^{4}Pa^{4}Pa^{4}Paprove that if a body is thrown vertically upwards, the time of ascent is equal to the time of decent.

the density of ice is 0.9 g/cm

^{3}. When it floats in water, what fraction of its volume will remain above surface?Q1 Give reasons:

Define one pascal.

time of throwing.

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 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???

the radius of the earth is 6370km and radius of the mars is 3440km.what is the acceleration due to gravity on mars if mass of the mars is 0.11times the mass of the earth

write the factor on which pressure depends

a stone is thrown vertically upward with a speed of 29.4 m/s. find -

1. the time taken by the stone to reach the maximum height.

2. maximum height reached by the body and

3. show that time of ascent is equal to time of descent.

RELATIONSHIP BETWEEN SMALL g AND CAPITAL G

how to make model of lactometer on archimedes principle

(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

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.

a body of mass 10 kg is taken to the centre of the earth. what will be its mass and weight there?

gravitational force on imaginary planet is 6 times stronger than gravitational force on earth. determine value of acceleration due to gravity on planet. also find weight of object of mass 50 kg on planet

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.

Do fluids exert pressure? How is pressure transmitted in a fluid

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.