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CBSE has declared its results and how was your scores in Physics?
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When a high diver in a swimming event springs from the board and “tucks in”, a rapid spin result. Why is this?
The angular momentum of a body is the product of Moment of inertia (A measure of rotational inertia and it depends on the mass as well as distribution of mass about the axis of rotation. Farther the masses, greater will be the rotational inertia) and the angular velocity (The speed of rotation)
The angular momentum of a body remains unchanged in the absence of any external torque.
When the diver dives, he is giving his body a turning and takes off with his limbs stretched. In the stretched position, the moment of inertia is more. When he “tucks in”, the moment of inertia decreases. But since this happens without any external torque, it would result in an increase in angular velocity so as to keep the angular momentum constant.
In CBSE Class XII 2011 results, girls outshined boys. After a long wait, CBSE published its results today, 23 May 2011.
You can check your result here.
CBSE Class XII Results 2011
What is buoyant force? I’m unable to understand practically from book. please give vast and practical explanation.. (Raj asked)
Whenever a body is immersed in a fluid, say water, it experiences an upward force acting on it. The upward force exerted by a fluid on an object immersed in it is called Buoyant force.
If the object placed in a fluid is denser than the fluid, it will sink. Though it experiences an upthrust, its weight will be more than the upthrust.
The upthrust is equal to the weight of liquid displaced by the immersed part of the body.
If the object is of less density than the fluid, it will come up and float.
For a floating body, the net weight is equal to zero, as the upthrust balances the actual weight of the body.
In vector multiplication, there are two types of multiplication: One in which the result is a scalar and the other in which the result is a vector.
Accordingly the two types of products of vectors are:
Scalar product (also called dot product) denoted byA.B
Vector product (also called cross product) denoted by AxB
A.B = AB cos Θ, where Θ is the angle between the directions of A and B
The physical meaning of dot product is that, “The product of the magnitude of one vector and the magnitude of the component of the other vector in the direction of the first vector.”
AxB = AB sinΘ
The direction of cross product is given by right hand cork screw rule