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Why boat not sink in water

Posted by Ankit Singh 8 years, 2 months ago

1 answers

Amar Kumar 8 years, 2 months ago

When an object enters water, two forces act upon it. There's a downward force (gravity) that's determined by the object's weight. There's also an upward force (buoyancy) that's determined by the weight of the water displaced by the object. An object will float if the gravitational (downward) force is less than the buoyancy (upward) force. So, in other words, an object will float if it weighs less than the amount of water it displaces.A huge boat will float because, even though it weighs a lot, it displaces a huge amount of water that weighs even more. Plus, boats are designed specifically so that they will displace enough water to assure that they'll float easily.

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at what angle that body should projected to reach maximum distance

Posted by Satish Pandey 8 years, 2 months ago

CBSE > Class 11 > Physics

1 answers

Rahul Poddar 8 years, 2 months ago

45°

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Collision in 1 dimension explain

Posted by Kaveri Shinde 8 years, 2 months ago

CBSE > Class 11 > Physics

0 answers

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State the principle of cricket propulsion and deduce the expression for the acceleration

Posted by Darshana Jaiswal 8 years, 2 months ago

CBSE > Class 11 > Physics

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Find |a+b+3c|=? such that |a| =2, |b|=3,|c|=4 where a _|_ b , b_|_ c but a & b are inclined at 60° .[ a , b, c are vectors]

Posted by Baishali Das 8 years, 2 months ago

CBSE > Class 11 > Physics

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A circular plate of uniform thickness has a diameter of 56m . A circular plate of 42m is removed from one edge of the plate . Find the CM of the remaining portion.

Posted by Manas Kumar 8 years, 2 months ago

CBSE > Class 11 > Physics

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A thin circular disc is rotating about a vertical axis passing through its centre. An insect is at rest at a point near the rim of the disc. The insect now moves along a diameter of the disc to reach its other end. During the journey of the insect, then the angular speed of the disc is (1) continously increase (2) first increase and then decrease (3) remains unchanged (4) continously decrease

Posted by Gourav Vj 8 years, 2 months ago

CBSE > Class 11 > Physics

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What is the difference between uniform and constant

Posted by Roshani Shaikh 8 years, 2 months ago

CBSE > Class 11 > Physics

1 answers

Dipen Saka 8 years, 2 months ago

Uniform means “same value at all points.” In the case of acceleration or velocity, if they are constant, they are uniform. (In contrast, the temperature in a room may be warmer near the ceiling, so it's non-uniform, but if the temperature at each point didn't change, it's constant.

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A light body and a heavy body have same momentum which one has greater k.e

Posted by Sachin Sahu 8 years, 2 months ago

CBSE > Class 11 > Physics

1 answers

Dipen Saka 8 years, 2 months ago

light body

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ifloss of kinetic energy of a body is 50% then find out loss in momentum

Posted by Hariom Shrivastava 8 years, 2 months ago

CBSE > Class 11 > Physics

1 answers

Rahul Poddar 8 years, 2 months ago

Loss of kinetic energy=200 '/,

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Equation of motion for the centre of mass

Posted by Sanjana Singh 8 years, 2 months ago

CBSE > Class 11 > Physics

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Define contact force?

Posted by Mithilesh Sah 8 years, 2 months ago

CBSE > Class 11 > Physics

1 answers

Rahul Poddar 8 years, 2 months ago

A contact is that force which requires physical contact to enforced (ex:-muscular force)

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Find the acceleration and velocity of a ball at the instant it reaches its highest point , if it was thrown up with velocity V.

Posted by Ashish Meena 8 years, 2 months ago

CBSE > Class 11 > Physics

1 answers

Chanda Chaurusiya 8 years, 2 months ago

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Experession for potential energy of an elastic spring

Posted by Kuldeep Sharma 8 years, 2 months ago

CBSE > Class 11 > Physics

1 answers

Arshika Vishwakarma 8 years, 2 months ago

1/2 k(x)2 where k is spring constant

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A body Intially at rest.It undergoes one dimensional motion with constant acceleration .show that power delivered to it at time 't'is proportional to 't'.

Posted by Priyam Verma 8 years, 2 months ago

CBSE > Class 11 > Physics

1 answers

Rahul Poddar 8 years, 2 months ago

Let the mass of the body is M, and it travel S distance in t time:P=W/T:P=F.S/T:P=Ma.S/t; here M, S, a is constant so, P=(MSa)/t; P is inversely proportional to time

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What is surface tension?

Posted by J K 8 years, 2 months ago

CBSE > Class 11 > Physics

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What are the factors that affected rotational motion !??

Posted by Nameera Rahman 8 years, 2 months ago

CBSE > Class 11 > Physics

0 answers

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What is rotational analogue of force? Give it's si unit?

Posted by Diwakar Vishal 8 years, 2 months ago

CBSE > Class 11 > Physics

2 answers

Shubh Jain 8 years, 2 months ago

Torque, newton metre

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Shubh Jain 8 years, 2 months ago

Torque, joule

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Define viscosity

Posted by Vanshika Kansal Vanshi 8 years, 2 months ago

CBSE > Class 11 > Physics

1 answers

Lasya Sivani 8 years, 2 months ago

It is a measure of resistence to flow which arises due to the internal friction between layers of fluid as they slip past one another while liquid flows.

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The distance travelled by a body is found to be directly proportional to square of time. Is the body moving with uniform velocity or uniform acceleration? If the distance travelled be directly proportional to time?

Posted by Mohd Abdullah 8 years, 2 months ago

CBSE > Class 11 > Physics