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Subject: Science, asked on 22/2/18

 
 
Qno. 148 plz explain the answer in detail..

​Q148. The fraction of a floating body of volume V0 and density d0 above the surface of liquid of density d will be 

    (a) dd0                                        (b) d0d

   (c) d -d0d                                   (d) d0d - d0

 

Sms
Subject: Science, asked on 21/2/18

In the experiment to find the density of SOLID object, the object should be lighter or denser than water? Why

Sms
Subject: Science, asked on 21/2/18

​In the experiment to find the density of a solid object, the object should be lighter or denser than water? Why?

Subject: Science, asked on 20/2/18

If the mass of the earth becomes half and its radius becomes twice then what will be the gravitational acceleration.

Subject: Science, asked on 19/2/18

Pls answer 24 no. Q. Pls fast its urgent
Q.24. An iron ball of density 7.8 g/cm2 and volume 200 cm3 is totally immersed in water. Calculate the upthrust on it.
[Ans. 1.96 N]

Subject: Science, asked on 18/2/18

Derive an expression to show that acceleration due to the gravity is independent of mass of the object

Subject: Science, asked on 18/2/18

There are two planets A and B of masses m1 and m2 respectively. They revolve around the sun in circular orbit. The orbital radius of A from the sun is twice that of orbital radius of B. The mass of A is twice that of mass B. Compare the forces of gravitation between A to Sun and B to Sun.

Subject: Science, asked on 17/2/18

determine the grvitational force btw a planet of mass 6*1024kg and an object of mass 1kg
placed on its surface .Let the radius be 6*10​6m and G=6*10^-11

​pls dont give any links 

Subject: Science, asked on 17/2/18

Please solve question 11
Q.11.An object of mass 2 kg and density 8000 kg/m3 is completely immersed in a liquid of density 800 kg/m3. Find the force of buoyancy on it?

Subject: Science, asked on 15/2/18

Please solve this:

106. You are given a sphere of radius 2 cm. If you are asked to select the best suited spring batatex to determine its weight, then out of the following which one would you prefer and why?
( The sphere is made up of an alloy of density 7000 kg/m3.)
(a) Range : 0-1000 g wt; Least count : 5 g wt
(b) Range: 0-500 g wt: Least count : 2.5 g wt
(c) Range : 0-250 g wt; Least count : 2.5 g wt
(d) Range : 0-100 g wt; Least count ; 1 g wt. 

Subject: Science, asked on 15/2/18

Please answer this and explain why question91

Q91. The principle of floatation states that 

          (a) Weight of body is less than upward thrust of liquid 

          (b) Weight of body is equal to the upward thrust of liquid

          (c) Weight of body is greater than upward of liquid

          (d) Weight of body is equal to the downward thrust of liquid 
 

Subject: Science, asked on 15/2/18

Solve this :

70. When all ice floating in water melts the level of water in container
(a) falls                                                   (b) rises
(c) remains unchanged                           (d) none of these                               

71. A jet plane flies in air because
(a) Streamlined flow of air causes lift
(b) upward thrust of air balances its weight
(c) No gravity acts on plane
(d) None of these 

Subject: Science, asked on 13/2/18

Road accidents at high speeds are very much worse than accidents at low speed??

Subject: Science, asked on 13/2/18

what is buoancy ?

Subject: Science, asked on 13/2/18

what is the importance of universal law of gravitation ?

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