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Figure shown a fixed surface inclined at...

Figure shown a fixed surface inclined at an angle `theta` to the horizontal. A smooth groove is cut on the incline along QR forming an angle `phi` with PR. A small block is released at point Q and it slides down to R in time t. Find t.

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The correct Answer is:
`t = (1)/("sin"theta "sin"phi) sqrt((2d)/(g))`
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