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Position vector of a particle is given by . Which of the following is/are true?

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Important Questions on Mathematical Tools in Physics
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The magnitude of scalar product of two vectors is and that of vector product is . The angle between them is

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Force acting on a particle is Work done by this force is zero, when the particle is moved on the line Here value of is (work done ):

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Equation of line is . Find a unit vector along the reflected ray .

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The vector is perpendicular to and is perpendicular to . The angle between and is :

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Forces proportional to and act along the sides of triangle in order. Their resultant represented in magnitude and direction as

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Which of the following statements are true for a moving body?

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A vector of length units makes an angle of with a vector of length units. If the angle which makes with is , then the value of is

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boys are pulling a heavy trolley by means of ropes. The boy in the middle is exerting a pull of . The other boys, whose ropes both make an angle of with the centre rope, are pulling with forces of and . Consider all the forces in the same plane. The magnitude of the resultant pull on the trolley is:
