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what is the difference between density and relative density ?
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
the density of ice is 0.9 g/cm3. When it floats in water, what fraction of its volume will remain above surface?
what is the difference between density and relative density of a substance
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?
Why do objects float or sink when placed on the surface of liquid?
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 ?
what is the relationship between "G" and "g"?
Difference between thrust and pressure?
A tank 5m high is half filled with water and then is filled to the top with oil of density 0.85 g/cm3. The pressure at the bottom of the bottom of the tank, due to these liquids is
a)1.85 dyne/cm2 b)89.25 dyne/cm2 c)462.5 dyne/cm2 d)500 dyne/cm2
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 sharp knife is more effective than a blunt knife.why?
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.
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 Newton's law of gravitation called universal law
why a truck or a motorbus has wider tyres
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/cm3
if the mass of the otheris 48g.what is its density
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?
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?
radius of an iron sphere is 0.21 cm If density of iron is 7.80g/cc calculate mass
Find pressure when a thrust of 20 N is applied on a surface area of 10cm2
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 mass and weight
what is the difference between thrust and force?
How archimedes principle is used to determine the purity of gold?
WHAT IS THE S.I. UNIT OF UPTHRUST?
A ball of relative density 0.8 falls into water from a height of 2m. The depth to which the ball will sink is
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.
The weight of a body in air is 100N. How much will it weigh in water if it displaces 400cm3 of water?
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 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.
Name two substances whose density cannot be measured.
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?
an object weighs 10N at the north pole of the earth. in a geostationary satellite, at a distance of 7R from the centre of the earth (of radius R), what will be its true weight and apparent weight?
1) State Archimedes principle?
2) Give two applications of archimedes principle.
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?
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
name the factors affecting pressure
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.
Define one pascal.
Q1 Give reasons:
why is it easier to cut an apple with a sharp knife rather than a blunt one?
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.
Explain the reason.
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
write the factor on which pressure depends
RELATIONSHIP BETWEEN SMALL g AND CAPITAL G
what are the applications of archimedes principle???
how to make model of lactometer on archimedes principle
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.
why do we feel lighter in a swimming pool??
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 mass of a density bottle is 25g when empty , 50g when filled completely with water 365g when filled completely with mercury. Find the density of mercury.
A cube of side 5cm is immersed in water and then in saturated salt solution. In
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