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Class 10 Class 12
What is the displacement of a point on the wheel of radius R initially in contact with ground when the wheel rolls forward half a revolution?

Given,

Radius of the wheel = R

When half revolution is made by the wheel, the point of contact moves from point A to C and hence undegoes the displacement

Distance displaced by the point of contact, AB =

Perpendicular distance traversed by the body = 2R

Therefore, total distance,

and

Thus the point of contact undergoes the displacement of magnitude  making an angle  with the ground.

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What is a scalar quantity?

A physical quantity that requires only magnitude for its complete specification is called a scalar quantity.
1212 Views

Give three examples of scalar quantities.

Mass, temperature and energy
769 Views

What is a vector quantity?

A physical quantity that requires direction along with magnitude, for its complete specification is called a vector quantity.
835 Views

What are the basic characteristics that a quantity must possess so that it may be a vector quantity?

A quantity must possess the direction and must follow the vector axioms. Any quantity that follows the vector axioms are classified as vectors.

814 Views

Give three examples of vector quantities.

Force, impulse and momentum.
865 Views