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what is the difference between density and relative density ?
How does a lactometer work ?
Why Newton's law of gravitation called universal law
what are the importance of universal law of gravitation??
A sharp knife is more effective than a blunt knife.why?
List two factors on which buoyant force depends.
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?
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
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.
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"?
Assuming that the mass of Earth is 100 times larger than the mass of Moon and the radius of Earth is about 4 times as that of Moon. Show that the weight of an object on Moon is 1/6th of that on Earth.
Difference between thrust and pressure?
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.
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?
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)
why a truck or a motorbus has wider tyres
Do all bodies immersed in a given fluid experience the same buoyant force
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 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.
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?
Aditi observed following observations while looking into a permanent slide. (i) Cells are long and cylindrical (ii) Light and dark bands are present. It could be a slide of : (a) striated muscle fibre (b) smooth muscle fibre (c) neuron (d) parenchyma cells
radius of an iron sphere is 0.21 cm If density of iron is 7.80g/cc calculate mass
Why does gas bubble released at bottom of lake grows in size as it rise ???? plz explain the earliest !
difference between mass and weight
what is the difference between thrust and force?
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/cm3 and g = 10 m/s2 the minimum and maximum pressure as calculated by the student should be :
(i) 16 N/m2, 40 N/m2
(ii) 32 N/m2, 80 N/m2
(iii) 640 N/m2,1600 N/m2
(iv) 3200 N/m2,8000 N/m2
Ishita noted down the following observations .
1. weight of stone in air =280 gwt2. weight of stone in salty water = 190 gwt3. weight of stone in water = 240 gwtfind the relative density of salty water.
WHAT IS THE S.I. UNIT OF UPTHRUST?
How archimedes principle is used to determine the purity of gold?
A solid weighs 30 gf in air and 26 gf when completely immersed in a liquid of relative density 0.8 . Find (1) the volume of solid and
(2) the relative density of solid
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.
Calculate the quantity of pure gold in 100 g of an alloy of gold and copper.The densitites of gold, copper and the alloy are 19.9 g / cc ,9 g / cc and 16 g / cc respectively.
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 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) State Archimedes principle?
2) Give two applications of archimedes principle.
In a house, following appliances are working:
4 tube lights of 40W for 8 hrs daily
2 fans of 60W for 10 hrs daily
1 TV of 200W for 8 hrs daily
Answer the following:
(a) Calculate the total energy consumption per day and for a month (month of April)
(b) What will be the units recorded in the meter for a month of 30 days
(c) Find the electricity bill if cost is Rs.5 per unit ?
Please answer as soon as possible tomorrow is my exam..
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.
how is the least count and the zero error of the spring balance is calculated?
name the factors affecting pressure
a weightless balloon contains 200g of water. its weight in water will be
State the laws of floatation.
a boy drops a stone from the top of a building 100m high. another boy throws an iron ball, with certain velocity, 2 second later the stone was dropped. calulate the velocity with which iron ball was thrown , so that both the ball and the stone strike the ground at the same time.
prove that if a body is thrown vertically upwards, the time of ascent is equal to the time of decent.
why do tractors have broad tyres?
Q1 Give reasons:
why is it easier to cut an apple with a sharp knife rather than a blunt one?
Define one pascal.
the density of ice is 0.9 g/cm3. When it floats in water, what fraction of its volume will remain above surface?
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
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 100cm3 block has a mass of 395g. Find its relative density. (density of water=1g/cm3)
write the factor on which pressure depends
what are the applications of archimedes principle???
RELATIONSHIP BETWEEN SMALL g AND CAPITAL G
A ball of relative density 0.8 falls into water from a height of 2m. The depth to which the ball will sink is
how to make model of lactometer on archimedes principle
A test tube is loaded with lead shots so that it floats in a liquid immersed to a mark on the tube. The total weigh of tube and lead shots is 30 gf. the tube is then placed in water and lead shots are added to sink the tube to the same mark. Now, the tube and lead shots weigh 35 gf. Calculate the relative density of liquid.
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.
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 small stone of mass m=200g is held under water in a tall jar and allowed to fall as shown in the fig. The free body diagram of the stone is also shown.
i) What F2 and m1 represent.
ii) Caldulate the net force acting on the stone and .
iii) its acceleration as it falls through water. (Neglect the force due to viscosity. Take the volume of the stone as 80 cm3, density of water as 1.0 gcm-3 and the acceleration due to gravity, g=10ms-2
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.
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