Subject: Science, asked on 7/3/18

## The moon is stuck in orbit around the Earth .Comment.

Subject: Science, asked on 7/3/18

## does the law of conservation of energy violate, when an object is allowed to fall freely from a certain height. justify.

Subject: Science, asked on 6/3/18

## Question 9

Subject: Science, asked on 6/3/18

## Dear Experts and Friends, can you please help me solve the given numerical:Q. A boy throws a ball vertically upwards and caches it back in 10 seconds. Calculate:  The velocity with which it was thrown up  Maximum height attained by the ball (g = 10 m/s2) Thank You !

Subject: Science, asked on 6/3/18

## Q. If a body falls freely under the effect of gravity in air over the earth surface then (A) Work done by gravity is positive                 (B) Work done by air frictional force is positive (C) Work done by gravity is negative                 (D) Work done by air fictional force is negative

Subject: Science, asked on 6/3/18

## 8.  What is the work done in the situation shown below?

Subject: Science, asked on 5/3/18

## Answer the question urgent please. Answer my question tomorrow is my exam 26.   In the experiment to determine the density of a given solid (insoluble in water) by using a spring balance and a measuring cylinder, a student made the following observations. mass of solid = 100g  initial reading of water in measuring cylinder = 50 ml Final reading of water in measuring cylinder=  75 ml calculate the density of a given solid on the basis of above observation.

Subject: Science, asked on 5/3/18

## Solve this : Q.  A student uses a spring balance of least count 0.5 gwt to measure minimum force requited to just move a wooden block on a surface. He holds the spring vertically and observes that the pointer of the spring balance is 3rd division above the mark on the scale. He then pulled the block with this spring balance by increasing the pull gradually and when the pointer is at 38th division, the block just starts moving. He calculates the force.  Its correct value will be:  (a) 38 gwt                               (b)   20.5 gwt (c) 19.0 gwt                            (d)   17.5 gwt

Subject: Science, asked on 5/3/18

## Reply #fast  Q.13. Define relative density. The density of wooden block is 2000 $kg/{m}^{3}$. Calculate its relative density.

Subject: Science, asked on 1/3/18

## can any one solve d whole sheet

Subject: Science, asked on 26/2/18

## If gravitational force acts between all objects, why dont they move towards each other

Subject: Science, asked on 25/2/18

## Pls answer this question Q.16. (i) Will a sheet of paper fall slower than one that is crumpled into a ball in vacuum? Why? (ii) Show mathematically that acceleration experienced by an object is independent of its mass. (iii) Show that the value of g = 9.8 m/${s}^{2}$ Given, G = 6.7

Subject: Science, asked on 24/2/18

## (a) ​A cube of side 5 cm is immersed in water and then saturated salt solution. In which case will it experience a greater buoyant forces ? If each side of the cube is reduced to 4 cm and then immersed in water, what will be the effect on the buoyant force experienced by the cube as compared to the first case for water. Given reason for each case.

Subject: Science, asked on 24/2/18

## ​ Please answer this Give reasons : (i)  A piece of paper takes much longer to fall than a stone through the same distance. (ii) The mass is constant everywhere whereas the weight keeps changing. (iii) The value of 'g' keeps changing as we move away from the earth whereas value of 'G' remains constant all over the universe.

Subject: Science, asked on 23/2/18

## The volume of 100 g of a solid substance is 25 cm² and the density of water is 1g/cm³. a) Find density of the substance. b) Find the relative density of the substance. c) Ravi finds his mass to be 42 kg on a weighing machine. Is his actual mass more or less than 42 kg? Give reason for your answer.

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