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Syllabus

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

what are the importance of universal law of gravitation??

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!!

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

Why Newton's law of gravitation called universal law

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

A.) 63m/s

B.)6.5m/s

C.)6.26m/s

D.)6.9m/s

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

^{-2})what is the relationship between "G" and "g"?

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?

Difference between thrust and pressure?

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

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?

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?

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

time are given below.

Plot the Distance- time graph for the motion of two trains. State which train has uniform motion and

which train has non- Uniform motion.

Also Plot Speed- time graph after calculating the speed of the two trains at different time intervals.Screenshot 2020-06-14 at 2.23.24 PM

why a truck or a motorbus has wider tyres

(a) 9.8 N

(b) 19.6 N

(c) 6.67 x 10?11 N

(d) 2 x 6.67 x 10?11 N

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

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

Mass of an object is 40 kg,what is its weight on earth?

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

(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

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

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 IS THE S.I. UNIT OF UPTHRUST?

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 is the difference between thrust and force?

^{3}( density of water =1g/cm^{3})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 ?How archimedes principle is used to determine the purity of gold?

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 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.

When does an object show weightlessness?

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.

1) an astronaut has 80 kg mass on earth

(a)what is his weight on earth?

(b)what will be his mass and weight on mars where g=3.7 m/s square

2)a certain particle has a weight of 30N at a place where the acceleration due to gravity is 9.8 m/s square

(a) what are its mass and weight at a place where acceleration due to gravity is 3.5 m/s square

(b)what are its mass and weight at a place where acceleration due to gravity is 0

1) State Archimedes principle?

2) Give two applications of archimedes principle.

A student placed an iron cuboid of dimensions 4 cm * 6 cm * 10 cm on a tray containing fine sand. He placed the cuboid in such a way that it was made to lie on the sand with its faces of dimension (a) 4 cm x 6 cm (b) 6 cm x 10 cm (c) 4 cm x 10 cm.

If the density of iron is nearly 8 g/cm

^{3}and g = 10 m/s^{2}the minimum and maximum pressure as calculated by the student should be :(i) 16 N/m

^{2}, 40 N/m^{2}(ii) 32 N/m

^{2}, 80 N/m^{2}(iii) 640 N/m

^{2},1600 N/m^{2}(iv) 3200 N/m

^{2},8000 N/m^{2}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

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?

State the laws of floatation.

^{3}^{ }and g = 10 m/s^{2}, find the minimum and maximum pressure as calculated by Arun.prove that if a body is thrown vertically upwards, the time of ascent is equal to the time of decent.

"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"

Q1 Give reasons:

Define one pascal.

Explain the reason.

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) is same on equator and poles

(b) is least on poles

(c) is least on equator

(d) increases from pole to equator

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

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 Gwhat are the applications of archimedes principle???

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

write the factor on which pressure depends

A man is asked to run with a 20kg steel block. Will it be easier for him to run with 20kg cotton replacing the block? Explain with reason.

RELATIONSHIP BETWEEN SMALL g AND CAPITAL G

how to make model of lactometer on archimedes principle

A dining hall has dimensions 50m X 15m X 3.5m . Calculate the mass of air in the hall . Given , density of air =1.30kg/metre cube.

why does buildings have wide foundations?

In the answer, why m = 5.2 kg?

mg = 5.2 kg right? Because it is given the bag 'weighs' 5.2 kg???

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

A piece of wood weighs 10 g in air .When a heavy piece of metal is suspended below it , the metal being submerged in water. The weight of wood in air plus metal in water is 14 g .the weight when both the wood and metal are submerged in water is 2 g. Find the volume and density of wood.

(i AM NOT ABLE TO SOLVE THE QUESTION AT ALL IS THERE SOME MISSING DATA)

when we move from the poles to the equator. hence,the value of g(grams) decreases. why?

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.

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 planet. also calculate the time it takes to fall through the height.

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.