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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??

Why Newton's law of gravitation called universal law

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

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?

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"?

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

Difference between thrust and pressure?

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.

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.

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 ?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.

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.

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

the density of ice is 0.9 g/cm

^{3}. When it floats in water, what fraction of its volume will remain above surface?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 stone is dropped from the edge of roof

given that g:9.8m/s

^{2}radius of an iron sphere is 0.21 cm If density of iron is 7.80g/cc calculate mass

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

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

difference between mass and weight

^{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.what is the difference between thrust and force?

^{24 }kg, Radius of earth = 6.4 x 10^{3}km and G= 6.7 x 10^{-11}Nm^{2 }kg^{-2}.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 body is dropped from the top of a tower. During the last second of its fall it covers 16/25th of the height of the tower. Calculate height of tower?

I found a link answering this question but it wasn't satisfactory.Can you please explain it properly to me as in the link i didnt understand how 2n-1 came and the second part too.can u answer it again??

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

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.

WHAT IS THE S.I. UNIT OF UPTHRUST?

Name two substances whose density cannot be measured.

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

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?

1. A woman is wearing sharp-heeled shoes. If the mass of the woman is 50 kg. And the area of one heel is 1 cm

^{2}.calculate the pressure exerted on the ground when the woman stands on just one heel. (g=10 m/s)1) State Archimedes principle?

2) Give two applications of archimedes principle.

difference between g and G .

(a) distance travelled , time taken and its acceleration

(b) final velocity, acceleration and the distance moved

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

when a force is applied through the free end of the spring balance A, the reading on the spring balance A is 15 gwt. What will be the reading of spring balance between B.

three balls ,a,b,c are kept in a straight line. the sepration between a c is 1 metre , and b is kept at the midpoint between them. the masses of a,b,c are 100 g ,200g,300g,respectively . find the net gravitation force on a,b,c .

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

State the laws of floatation.

name the factors affecting pressure

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

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

Define one pascal.

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?

Q1 Give reasons:

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 man weighs 600N on the surface of the earth. What would be his mass and weight on the surface of the moon ? (take of g

_{earth}=_{ }10m/s^{2})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 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 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?

write the factor on which pressure depends

the ground. If the pump takes 5 minutes to fill the tank by consuming 10kW power the efficiency

of the pump should be (Take g= 10ms-2)

(A) 60% (B) 40%

(C) 20% (D) 30%

RELATIONSHIP BETWEEN SMALL g AND CAPITAL G

what are the applications of archimedes principle???

how to make model of lactometer on archimedes principle

Differentiate between g and G

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.

Two spherical stars each of Mass M with their centres distance D apart revolve under mutual gravitational attraction about the point midway between their centres. Find the period of revolution.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.

1) tan

^{-1}[ GM / gL ] 2) tan^{-1}[ GM / 2gL ] 3) tan^{-1}[ GM / gL^{2}] 4) tan^{-1}[ 2GM / gL^{2}]A cube of side 5cm is immersed in water and then in saturated salt solution. In

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

1.why a camel can run easily in deserts?2.why an army tank weighing more than thousand tonne rests upon a continous chain?3.what is the meaning of the following sentence."pressure exerted in any confined mass of fluid is transmitted undimished in all directions?4.how will you find relative density by using archemede's principle?5.why does a ship float on water?plz tell me how to calculate (6.7x10

^{-11}Nm^{2}kg^{-2}x6x10^{24}kgx 7.4x 10^{22}kg) divided by(3.84x 10^{8})^{2}