Subject: Science, asked on 18/11/10

## A stone is dropped into a well, 44.1 m deep. The sound of the splash is heard 3.13 s after the stone is dropped. Find the velocity os sound in air .

Subject: Science, asked on 20/10/14

## 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?

Subject: Science, asked on 25/10/13

## A sharp knife is more effective than a blunt knife.why?

Subject: Science, asked on 6/1/14

## how many moles are there in each one of the following?(A)19.0 atoms of fluorine.(B) 280 g of silicon

Subject: Science, asked 3 days, 4 hours ago

## Meritnation experts i need my ans soon

Subject: Science, asked on 4/7/10

## If Z = 3, what would be the valency of the element? Also, name the element.

Subject: Science, asked on 19/7/13

## Why Newton's law of gravitation called universal law

Subject: Science, asked on 28/9/17

## Two metallic spheres each of mass M are suspended by two strings each of length L. The distance between the upper ends of strings is L (the same as length of the two strings). The angle which the strings will make the vertical due to mutual attraction of the sphere is : 1) tan-1[ GM / gL ]                        2) tan-1 [ GM / 2gL ]                     3) tan-1[ GM / gL2 ]                     4) tan-1 [ 2GM / gL2  ]

Subject: Science, asked on 31/12/17

## a disc rotates about a fixed axis. Its angular velocity w varies with time according to the equation w=at+b. Initialy at t=0 its angular velocity is 1 rad/s and and angular position is 2rad , at the instant t=2s , angular velocity is 5 rad/s . Determine angular positon and angular accelaration a when t =4s

Subject: Science, asked on 22/8/16

## How much deep inside earth ( radius r ) should a man go , so that his weight becomes 1/4 of that one the earth surface?

Subject: Science, asked on 26/11/13

## the kE acquired by a mass m in travelling a certain distance s ,starting from rest ,under the action of a constant force is directly proportional to:a)mb)/mc)1//md)none of these

Subject: Science, asked on 5/9/15

## The distance between the centres of moon and earth is D. The mass of earth is 81 times the mass of moon . At what distance from the centre of the earth, the gravitational force will be 0

Subject: Science, asked on 6/7/10

## What happens to the force between two objects, if (i) the mass of one object is doubled? (ii) the distance between the objects is doubled and tripled? (iii) the masses of both objects are doubled?

Subject: Science, asked on 15/1/16

## Two pendulums begin to swing simultaneously. The first pendulum makes 9 full oscillations when the other makes 7. The ratio of lengths of the two pendulum is:

Subject: Science, asked on 10/3/16

## The true weight of an object was calculated as 500g. When immersed in a fluid, the fluid displaced by it weighs 150g. What is the apparent weight of the object in water?

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