Good question

Imagine the state of your hand!

Fun fact: I can never do any physics assignments when I try to, but ask me some ridiculous question with little to no basis in reality and suddenly my brain goes into overdrive. This is a regular occurrence.

Ok. So would the chicken have to be slapped on one side or multiple places if you want an even distribution of heat? Also, can you substitute multiple slaps instead of one slap?

^^ could you change the speed of slaps to the rate of slaps?

Surely it would depend on the rate of conversion.

This is why I don't eat chicken.

Well, for one thing, the direct directional force of slapping is a kind of kinetic energy that does not get converted into thermal energy significantly, the previous amount is just the raw energy needed to cook a chicken and how fast your hand would have to be moving to have that energy. To actually cook it you would need to either need to rub it instead or slap it at an angle into something else to cause friction. The previous calculation also wasn’t taking into account putting your whole body into it, which would reduce the speed needed to 5.3% of the original. Each slap you spread it across would also reduce the speed required by a factor of the number of slaps eg: 3 slaps needs 1/3 speed for each. Though, the heat is going to be spread across both your hand and the chicken or chicken and the ground so that doubles it again.
In conclusion, either slap it around a very large circle with a 392000 m/s running start or rub it at 7400000 m/s, divided by number of seconds spent rubbing.

The circle probably wouldn’t have an even distribution but if you rubbed all around the rubbing would. It would also cook your hand, but oh well.
Sorry for rambling

If calculations be the spice to my chicken, Ramble on

Update: These calculations are actually for how hard you'd have to slap an oven to cook a chicken. My bad.