4. Dua batang homogen dengan ukuran yang berbeda disusun hingga membentuk L seperti tampak pada gambar di bawah. Letak titik berat bidang homogen di atas terhadap titik O adalah. A. (2,2) B. (2,3) C. (2,4) D. (3,2) E. (3,3)

5. Dua buah pegas identik disusun seperti gambar berikut.
Masing-masing pegas memiliki konstanta 400 N/m. Bila kedua susunan pegas tersebut bertambah panjang dengan panjang yang sama, maka perbandingan massa beban susunan seri dan paralel adalah . A.1:1
B.2:3
C. 3 : 2 D.1:4 E.4:1

Two loudspeakers, 5.5 m apart and facing each other, play identical sounds of the same frequency. you stand halfway between them, where there is a maximum of sound intensity. moving from this point toward one of the speakers, you encounter a minimum of sound intensity when you have moved 0.33 m . assume the speed of sound is 340 m/s.part a) what is the frequency of the sound? part b) if the frequency is then increased while you remain 0.21 m from the center, what is the first frequency for which that location will be a maximum of sound intensity? express your answer to two significant figures and include the appropriate units.