An echo sounder produces ultrasound of frequency. The ultrasound travels in water at a speed of 1.5 km/s.

What is the wavelength in water of ultrasound of this frequency?

• 16 m

• 0.063 m

• 63 m

• 36 m

A javelin has a mass of 0.80 kg.

The javelin is released with 250 J of kinetic energy.

What is the speed of the jevelin?

• 630 m/s

• 25 m/s

• 18 m/s

• 13 m/s

Pada gambar di samping ini urutan perubahan energi adalah ..........

• Energi listrik - energi kimia - energi kalor

• Energi kimia - energi listrik - energi kalor

• Energi listrik - energi kimia - energi cahaya

• Energi kimia - energi listrik - energi cahaya

Sebuah rumah menggunakan 4 lampu pijar 25 W selama 10 jam/hari, sebuah TV 50 W dipakai selama 10 jam/hari. Sebuah setrika 300 W selama 4 jam/minggu. Jika 1 Kwh tarifnya Rp 300,00 dan biaya beban listriknya sebesar Rp 2000,00 /bulan. Biaya rekening listrik yang seharusnya di bayar setiap bulan (30 hari) adalah ...............

• Rp 22.490,00

• Rp 20.490,00

• Rp 16.940,00

• Rp 14.940,00

Perhatikan gambar berikut ini!

Dari gambar diatas, jika waktu yang dibutuhkan bandul bergerak dari A dampai ke C 0,4 sekon, maka besar frekuensi getaran yang dihasilkan adalah ..............

• 0,20 Hz

• 1,25 Hz

• 2,00 Hz

• 0,80 Hz

Energi from petrol is used to operate an engine. The engine drives a generator, which produces electrical energy.

What is the overall efficiency of the process?

• 25%

• 30%

• 55%

• 83%

A loundspeaker produces a sound wave of frequency 50 Hz. The amplitude of the sound wave is increased.

What is heard?

• a louder sound of a higher pitch

• a louder sound of the same pitch

• sound of a higher pitch but the same loudness

• sound of the same pitch and loudness as before

The diagram shows a circuit.

Which sircuit diagram shows this circuit?

• 
• 
• 
• 

Which list gives the astronomical objects in order of size, starting with the largets?

• planet-galaxy-solar system-Sun

• planet-solar system-Sun-galaxy

• galaxy-solar system-planet-Sun

• galaxy-solar system-Sun-planet