CBSE > Class 11 > Physics | CBSE Board | Homework Help

1. To find the volume of a body - : Let W1 and W2 be the weights of body in air and water respectively. If V is volume of body, then from Archimedes principle W1 - W2 = V p g Whereas, p = rho [ loss of weight of body In water = upthrust ] . 2. Specific gravity of material of a Solid w.r.t water Specific gravity of body = weight of body in air /weight of equal volume of water = weight of body in air / upthrust = weight of body in air / loss of weight of body In water S. G. = W1 / W1 - W2 3. Condition of flotation of body.

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Under what condition is the relation S=It is correct

Posted by Shubham Kumar 8 years ago

CBSE > Class 11 > Physics

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Two ships A and B are started from 1 jan 2017 sat and this ship return from next saturday how many ships are crossing

Posted by Ayush Simraiya 8 years ago

CBSE > Class 11 > Physics

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what is the formula of radial acceleration

Posted by Bharti Sinha 8 years ago

CBSE > Class 11 > Physics

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Why birds are often seen to swell their feather in winter season?

Posted by Siddhant Singh 8 years ago

CBSE > Class 11 > Physics

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In which method of heat transfer does gravity not play any part?

Posted by Siddhant Singh 8 years ago

CBSE > Class 11 > Physics

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Chintan Rajgor 8 years ago

Radiation

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What is accelration

Posted by Suraj Baliyan 8 years ago

CBSE > Class 11 > Physics

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Find center of mass for alphabetic letters

Posted by Jaya Prasad 8 years ago

CBSE > Class 11 > Physics

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How will the kinetic energy of the body change if there momentum is doubled

Posted by Sanchit Varshney 8 years ago

CBSE > Class 11 > Physics

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Bharti Sinha 8 years ago

kinetic energy become 4times

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What is variable force

Posted by Sanchit Varshney 8 years ago

CBSE > Class 11 > Physics

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Chintan Rajgor 8 years ago

If the amount on force acting on the body changes with time it is called variable force

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A ball of mass 10kg moving with a velocity of 10m/s.It strikes another ball moving in the same direction with velocity 4 m/s. Calculate their final velocity.

Posted by Saumya Singh 8 years ago

CBSE > Class 11 > Physics

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What is streamline ?

Posted by Hemantie Chakresh 8 years ago

CBSE > Class 11 > Physics

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Ahana Jasrotia 8 years ago

When a liquid flows such that each particle of the liquid passing a given point moves along same path & velocity as its predecessor.

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Speed of efflux: torricelli's law

Posted by Siva Poorani 8 years ago

CBSE > Class 11 > Physics

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Siddhant Singh 8 years ago

Speed of efflux= √2gh= speed of a free falling body

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What is difference between viscus drag and friction

Posted by Anchal Gautam 8 years ago

CBSE > Class 11 > Physics

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A river is flowing 5m /min from west to east . A man on the south bank of river capable of swimming 10m/min in still water want to cross the river in shortest path . ln which direction should he swim.

Posted by Poona Pandv 8 years ago

CBSE > Class 11 > Physics

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A river is flowing 5m /min from west to east. A man on the south bank of river capable of swimming 10m /min in still water want to cross the river in shortest path. In which direction should he swim

Posted by Poona Pandv 8 years ago

CBSE > Class 11 > Physics

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Ranbir Trikha 8 years ago

---------> V river = 5m/min V man = 10 m/minsuppose width of river is x mts Case 1 if he travels due north then his resultant velocty ( due to velocity of downstream of water) acts 30 north of east and the distane to be covered to reach the other bank increses to = x/cos 30 i.e., 2x /31/2 and resultant velocity is 11.2 m/min so time taken is x / 9.7 mins Case 2 if he travels due 30 north of east then his resultant velocty ( due to velocity of downstream of water) actsdue north and the distane to be covered to reach the other bank will be x mts and resultant velocity is 8.7 m/min so time taken is x / 8.7 mins So case 1 takes least time he should travel due north(a)

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A person is standing ona truck moving with a constant speed of 14.7 m/s on a horizontal road. The man throws a ball in such a way that it returns to the truck after the truck has moved 58.8 m. Find the speed and angle of projection (a) as seen from the truck, (b) as seen from road.

Posted by Vishal Kumar 8 years ago

CBSE > Class 11 > Physics