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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??
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
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 density and relative density of a substance
Why do objects float or sink when placed on the surface of liquid?
which exerts a greater force on the table: a 1.7 kg mass physics book lying flat on a table or a 1.7 kg mass book standing on one side on the table?
what is the relationship between "G" and "g"?
Difference between thrust and pressure?
Imagine you are visiting planet Mars. You want to record your weight your weight on this planet. If your weight on Earth is 450N, what would you record as your weight on mars? (Take g=10m/s2 , mass of planet Mars= 6*1023Kg and its radius is 4300 KM.
thrown up vertically returns to the thrower after 6 s. Find
velocity with which it was thrown up,
maximum height it reaches, and
position after 4 s.
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
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.
happens to the force between two objects, if
mass of one object is doubled?
distance between the objects is doubled and tripled?
masses of both objects are doubled?
which force is responsible for the moon revolving around the earth?
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)
two bodies of mass 1 kg and 100 kg respectively are dropped simultaneously fron same height 4.9 m in vacuum. Calculate and comapre their final velocities just before hitting the ground and the time interval in which they will hit the ground (g= 9.8m/s2)
A balloon of volume 50 m3 (m cube) is filled with hot air of density 0.4kgm3 (kgm cube). If the weight of the fabric of balloon is 12 kgf and equipment "P" is attached to it, such that balloon is in the state of equilibrium. Calculate : i) Weight of hot air.
ii) Weight of hot air, balloon, and equipment.
iv) weight of equipment.
why a truck or a motorbus has wider tyres
Q1 Give reasons:
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?
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.
what are the characteristics of gravitational force.......????
The weight of a man is 690N which contains 5.3 x 10-3 m3 of blood. Find blood's weight. Take density of blood as kg/m3
relative density of gold is 19.3.if the density of water is 1000kg/m3 ,what is density of gold in si unit?
Two identical containers have liquids of different densities d1 and d2 but they weigh the same when kept on weighing pan. The density of mixture when they are mixed together will be.
radius of an iron sphere is 0.21 cm If density of iron is 7.80g/cc calculate mass
A sharp knife is more effective than a blunt knife.why?
The gravitational force on a body of mass 60 kg is 588 N. If mass of earth is 6 x 1024 kg and radius of earth is 6.4 x 106m; find the value of G
difference between mass and weight
a fish weighs less in water than in air.why?
WHAT IS THE S.I. UNIT OF UPTHRUST?
what is the difference between thrust and force?
The moon is acted by gravitational pull on earth , still it does not fall on the earth. Explain why ? Determine the ratio of weight of an object of mass 50 kg on earth and on moon.(thake gearth = 10 m per second square ) ( gearth = 6gmoon )
the acceleration due to gravity on a planet is 1.96m/s2 .If it is safe to jump from a height of 3m on the earth, the corresponding height of the planet will be ?
A body weighs 1 kg on the surface of the moon.If the mass of the moon is 7.4*10 power 22 kg,the radius pf moon is 1740 km and the gravitational constant 6.67*10 power -11 Nm power 2 *kg power -2,calculate a) the force acting on the i)body ii)moon b)the acceleration produced in the object c)the acceleration produced in the moon
How archimedes principle is used to determine the purity of gold?
If a body takes 10 sec to reach the highest point, when thrown vertically upwards, then the time taken by the same body to reach back will be ?
a) 20 sec b) 5 sec c) 10 sec d) None of the above
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.
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?
What keeps the moon in uniform circular motion around the earth?
Name two substances whose density cannot be measured.
1) State Archimedes principle?
2) Give two applications of archimedes principle.
a boy drops a coin from the top of a tower 50 m high. find the time taken by the coin to reach the ground.
A solid weighs 80g in air, 68g in water and 60g in oil. Calculate the relative density of oil and solid.
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 ?
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
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
State the laws of floatation.
prove that if a body is thrown vertically upwards, the time of ascent is equal to the time of decent.
During Freefall, what is the weight of a body? Give reason for your answer.
Define one pascal.
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/m3 and volume 100 cm3 is totally immersed in water. Calculate
(a) The weight of the iron piece in air
(b) The upthrust
(c) Apparent weight in water
Why does a plastic ball released under water come up to the surface of 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
why is it difficult to hold a school bag having a strap made of thin & strong strip?
what are the applications of archimedes principle???
A boy weighing 50 kg is standing on floor of lift .Find the weight when
a) lift moves up with uniform velocity b) lift moves down with an accleration of 4.9 ms-2
c) lift moves up with anacceleration of 4.9 ms-2 d) lift begins to fall freely under gravity
write the factor on which pressure depends
A body weighs 600g in air, 450g in water and 480g in a liquid.Then what is the relative density of the solid?
RELATIONSHIP BETWEEN SMALL g AND CAPITAL G
how to make model of lactometer on archimedes principle
calculate the acceleration produced in a 2kg stone due to the earth
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.
the density of ice is 0.9 g/cm3. When it floats in water, what fraction of its volume will remain above surface?
a body weighs 25 kg on the surface of the earth. if mass od the earth is 6.0*1024 kg, the radius of the earth is 6.4*106 m and the universal gravitational constant is 6.7*10-11Nm2/kg2, calculate
please help fast!!
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.
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.
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