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Dari permukaan tanah sebuah bola (8 ons) ditendang...

 

Dari permukaan tanah sebuah bola (8 ons) ditendang dengan laju awal begin mathsize 14px style 30 space straight m over straight s end style. Jika percepatan gravitasi begin mathsize 14px style 10 space straight m over straight s squared end style dan bola mencapai tinggi maksimum 5 m, maka daya tendangan bola besarnya adalah ... (watt).

Jawaban:

Diketahui:
begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell v subscript 0 end cell equals cell 30 space straight m over straight s end cell row m equals cell 8 blank ons equals 0 , 8 blank kg end cell row g equals cell 10 space straight m over straight s squared end cell row cell h subscript m a x end subscript end cell equals cell 5 blank straight m end cell end table end style 

Ditanya:
P = ?

Jawab

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell h subscript m a x end subscript end cell equals cell fraction numerator v subscript 0 superscript 2. sin theta squared over denominator 2. g end fraction end cell row cell sin theta end cell equals cell square root of fraction numerator 2. g. h subscript m a x end subscript over denominator v subscript 0 superscript 2 end fraction end root end cell row cell sin theta end cell equals cell square root of fraction numerator open parentheses 2 close parentheses. open parentheses 10 close parentheses. left parenthesis 5 right parenthesis over denominator 30 squared end fraction end root end cell row cell sin theta end cell equals cell square root of 10 squared over 30 squared end root end cell row cell sin theta end cell equals cell 1 third end cell row blank blank blank row t equals cell fraction numerator v subscript 0. sin theta over denominator g end fraction end cell row cell blank t end cell equals cell fraction numerator 30. open parentheses 1 third close parentheses over denominator 10 end fraction end cell row t equals cell 1 blank straight s end cell row blank blank blank row P equals cell W over t end cell row P equals cell E subscript p over t end cell row P equals cell fraction numerator m. g. h over denominator t end fraction end cell row P equals cell fraction numerator open parentheses 0 , 8 close parentheses. open parentheses 10 close parentheses. left parenthesis 5 right parenthesis over denominator 1 end fraction end cell row P equals cell 40 blank watt end cell end table end style 

Jadi, daya tendangan bola adalah 40 Watt

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