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Is hat i- hatj a unit vectror ? Exolain...

Is ` hat i- hatj` a unit vectror ? Exolain.

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` (hat i-hat j)` not a unit vector. If ` vec R=hati -hatj`, then
`R =sqrt ((1(^(2) + (-1)^(2)) =sqrt 2 ` and angle `beta` which `
` vec R` makes with X-axis, is given by,
` cos beta = 1//sqrt 2 = cos 45^(@)`.
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