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Syllabus

what is the difference between density and relative density ?a. more than 40 kg.

b.less than 40 kg

c.40kg

d.zero

How does a lactometer work ?

what are the importance of universal law of gravitation??

List two factors on which buoyant force depends.

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

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

^{-3}. The pressure exerted by the liquid on the base of the jar is(Take g = 10 m s

^{-2})A. 1.2 $\times $ 10

^{3}Pa B. 2.4 $\times $ 10^{3}PaC. 1.2 $\times $ 10

^{5}Pa D. 2.4 $\times $ 10^{5}Pa^{ }Why do objects float or sink when placed on the surface of liquid?

pls answer fast....😔😔😔😔😭😭😭😭

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

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?

Difference between thrust and pressure?

1) tan

^{-1}[ GM / gL ] 2) tan^{-1}[ GM / 2gL ] 3) tan^{-1}[ GM / gL^{2}] 4) tan^{-1}[ 2GM / gL^{2}]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.

A tank 5m high is half filled with water and then is filled to the top with oil of density 0.85 g/cm

^{3}. The pressure at the bottom of the bottom of the tank, due to these liquids isa)1.85 dyne/cm

^{2}b)89.25 dyne/cm^{2}c)462.5 dyne/cm^{2}d)500 dyne/cm^{2}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

Why Newton's law of gravitation called universal law

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?

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 ?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?

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

Q.23. A bead starts sliding from a point P on a frictionless wire with initial velocity of 5 m${s}^{-1}$. Find the velocity of bead at point R (take g = 10 m${s}^{-2}$)

(1) 7 m/s

(2) 5$\sqrt{2}$ m/s

(3) 6$\sqrt{2}$ m

(4) 6 m/s

difference between mass and weight

^{2 ,}density of water= 1000 kg/m^{3})a) 0.1 mm b) 1 m c) 1 mm d) 0.1 m please explain answer in detail.

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

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

what is the difference between thrust and force?

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. the pressure of the gas in the cylinder and

b. the pressure of mercury at the bottom of the U tube.

WHAT IS THE S.I. UNIT OF UPTHRUST?

R/5 from the surface of the Earth (radius R)?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.

Name two substances whose density cannot be measured.

a. 365 days b. 9/4*365 days

c. 27/8*365 days d. 25/16*365 days

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?

A) 40 kg

B) Less than 40 kg

C) More than 40 kg

D) Zero

AT A PLACE, VALUE OF g IS LESS BY 1% THAN ITS VALUE ON THE SURFACE OF THE EARTH(RADIUS OF THE EARTH=6400KM).

THE PLACE IS

(A)64KM BELOW THE EARTH'S SURFACE (B)63KM ABOVE THE EARTH'S SURFACE

(C)30KM ABOVE THE EARTH'S SURFACE (D) 32 KM BELOW THE SURFACE OF THE EARTH

1) State Archimedes principle?

2) Give two applications of archimedes principle.

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

difference between g and G .

Find pressure when a thrust of 20 N is applied on a surface area of 10cm

^{2}A solid weighs 80g in air, 68g in water and 60g in oil. Calculate the relative density of oil and solid.

EXPERT ATTENTION REQUIRED ASAPQ: The reading of a spring balance when a block is suspended from it in air is 60 N. The reading is changed to 40 N when the block is submerged in water. The relative density of the block is_______ .

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

name the factors affecting pressure

(A) l decreases

(B) l increases

(C) h decreases

(D) h increases

State the laws of floatation.

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

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

Q1 Give reasons:

a weightless balloon contains 200g of water. its weight in water will be

a)100g

b)200g

c)400g

d)zero

Define one pascal.

(A) IT IS A FREELY FALLING BODY

(B) IT IS MOVING WITH A CONSTANT SPEED

(C) IT SUFFERS NO ACCELERATION

(D) TIME PERIOD OF SATELLITE IS INDEPENDENT OF SATELLITE

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.

orbital velocity of earth's satellite near the surface is 7 km/s. when the radius of the orbit is 4 times than that of earth's radius, then orbital velocity in that orbit is

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 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 cube is 2 cm above water level. What is the measurement of its one side?

RELATIONSHIP BETWEEN SMALL g AND CAPITAL G

what are the applications of archimedes principle???

how to make model of lactometer on archimedes principle

An object of volume 5 cc is immersed first in water and then in salt solution . In which case will it experience a greater buoyant force ? what will be the effect on the buoyant force if the volume of the object is increased to 8 cc ?

I want the answer immediately !!!!!!!

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.

in a 1 kg mass somewhere in

space. How much will the acceleration of a 3 kg mass be at the same place? Give your answer

with reason.

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.

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.

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

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 sphere of mass 5 kg and volume 2.2x 10 -4 m3 is completely immersed in waater. find the buoyant force exerted by water on the sphere. Density of water = 1000kg/m3 (g=9.8 m/s2)

Please!!!!!!! i have my exam tomorrow!!