physics self assessment #106

[riseNshine]

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What is the magnitude of the horizontal component of air resistance question.

For this one, if Force of air resistance=pv^2. And, vx=vcos(theta), then wouldn't Force of air resistance=p(vx^2cos2(theta))

I don't understand why they just multiple the pv^2 by cos theta without substituting v for vcostheta then squaring it.

thanks

 

[adrakdavra]

I am not sure , but may be the cos theta is only a direction that need not to be squared.