1.

A tennis ball receives a top spin when struck by a racket and describes a curved trajectory. The top spin implies that the rotatory motion of the top surface of tha ball is in the direction of the translatory motion of the ball. Which one of the following statement is the best description of the trajectory ?

Answer»

PRESSURE on the top surface is LOWER, trajectory RISES
Pressure on the top surface is lower, trajectory dips
Pressure on the top surface is higher, trajectory rises
Pressure on the top surface is higher, trajectory dips

Solution :D
In ball's frame `v_("air")=v+wr`
`v_("air")=v-wr`
APPLYING Benoulli's
`P_("above") GT P_("below")`
`:.` trajectory dipes


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