`a` 

`+` `f=ω/2π` `=` $\dfrac{10\pi }{2\pi}$ `=5`  `(Hz)` 

`+` `T= $\dfrac{2\pi}{ω}$ `=` $\dfrac{2\pi}{10\pi}$ `=` `0,2`  (s)

`+` `A =0,5cm`

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`b` 

`Uo = 5cos(10π.2,5-π/6)`

`=` `-4,3301` `cm` 

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`c` 

$\lambda$`=` `v.T` `=` `50.0,2=10`

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`d` 

`t=(7-1).0,2=1,2s` 

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`e` 

`S=v.t = 50.2,05=102,5` 

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`f` 

$U_M$ `=` Acos(ωt-2π``/`\lambda`-π/6)`

$U_M$ `=` `Acos(ωt-`$\dfrac{2π}{\lambda\\}$ `-` `π/6`) `=` `0,5cos``(10πt-π/30)`