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Syllabus

what is the difference between density and relative density ?Why Newton's law of gravitation called universal law

How does a lactometer work ?

what are the importance of universal law of gravitation??

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?

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

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 .

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?

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.

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

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.

^{24 }kg, Radius of earth = 6.4 x 10^{3}km and G= 6.7 x 10^{-11}Nm^{2 }kg^{-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.

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

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 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 :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.......????

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

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

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

^{6}.difference between mass and weight

WHAT IS THE S.I. UNIT OF UPTHRUST?

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 is the difference between thrust and force?

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

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.

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.

Two satellites are revolving around earth. Orbital radius and orbital velocity of the one satellite is R1 AND V1 respectively. Find the orbital radius of other satellite whose orbital velocity is v2.

Please answer this.,

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 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 ?Name two substances whose density cannot be measured.

If the distance between two masses is increased by a factor of 5,by what factor would the mass of one of them have to be altered to maintain the same gravitational force? Would this be an increase or decrease in the mass?

Determine the height h above the surface where the value of g

i=Falls to 1% of the value at the surface

ii-falls by 1% of the value at the surface

B-Sir/mam i was getting confused with the variation in "g" so i ll the statements could yu check

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) State Archimedes principle?

2) Give two applications of archimedes principle.

The pressure due to atmosphere is 1.0138 * 10 Pa.Find the force exerted by the atmosphere on the top surface of a table 2.0 m long and 1.0 m wide.

difference between g and G .

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

the gravitational force between two object is 49N .how much distance between these object be decreased so that

1. the force between them become double and also for tripal

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

Q.2)The gravitational force between two objects is 100 N. How should the distance between these objects be changed so that the force between them becomes 50 N ?

(a) distance travelled , time taken and its acceleration

(b) final velocity, acceleration and the distance moved

State the laws of floatation.

1) tan

^{-1}[ GM / gL ] 2) tan^{-1}[ GM / 2gL ] 3) tan^{-1}[ GM / gL^{2}] 4) tan^{-1}[ 2GM / gL^{2}]name the factors affecting pressure

A body of mass 2 kg floats in a liquid. What is the buoyant force acting on the body? I have been given the answer as 19.6 N. Is it correct? Please explain.

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

The maximum vertical distance through which a fully dressed astronaut can jump on the earth is 0.5 m. If mean density of the moon is two thirds that of the earth and radius is one quarter that of the earth, the maximum vertical distance through which he can jump on the moon and the ratio of time of duration of the jump on the moon to that on the earth are :

(A) 3m, 6 : 1 (B) 6m, 3 : 1(C) 3m, 1 : 6 (D) 6m, 1 : 6Q1 Give reasons:

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.

calculate the acceleration produced in a 2kg stone due to the earth

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 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 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??

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

what are the applications of archimedes principle???

write the factor on which pressure depends

^{2})RELATIONSHIP BETWEEN SMALL g AND CAPITAL G

how to make model of lactometer on archimedes principle

(A) T ? d

(B) T ? sqrt(d)

(C) T ?1/sqrt(d)

(D) T ?1/d

why does buildings have wide foundations?

You find your mass to be 42 kg on a weighing machine. Is your mass more or less than 42 kg ?

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

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.

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.

The volume of a 500g sealed packet is350cm3. Will the packet float or sink in water if the density of water is 1g/cm3?what is the volume of water?

A cube of side 5cm is immersed in water and then in saturated salt solution. In

A ball of relative density 0.8 falls into water from a height of 2m. The depth to which the ball will sink is

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?a cubical block of side 2cm is lying on a table.if the density of the material of the cube is 10,000 kg per metre cube find the pressure exerted by the block on the table.(g=10 metre per second square)