Soal kelas 8 (English Ver)

Subyek: Soal kelas 8 (English Ver) Thu Sep 29 2011, 19:36

Okay, cekidot langsuuuung :

1. A toy taxi moves in 1 minute to reach a distance of 30 metres. The average speed of the movement is...

A. 0.3 m/s
B. 0.5 m/s
C. 2.0 m/s
D. 3.0 m/s

2. A man rode his bike down from Kaliurang. His initial speed was 5 m/s. Five seconds later, his sped became 15 m/s. The acceleration of the bike is....

A. 2 m/s²
B. 4 m/s²
C. 6 m/s²
D. 7 m/s²

3. A boy has just lifted his school bag of 30 N from the floor on to his lap through a height of 50 cm. The potential energy of the bag now is....

A. 15 J
B. 30 J
C. 150 J
D. 300 J

4. A sports car of 900 kg can accelerate at 2.5 ms^-2. What is the net force needed for this acceleration?

A. 360 N
B. 450 N
C. 1,125 N
D. 2,250 N

5. The initial volume of the air in the piston is 1,000 cm³ and its pressure is 50 Pa. We compress it and the volume becomes 500 cm³. What is the air pressure now?

A. 100 Pa
B. 50 Pa
C. 25 Pa
D. 1 Pa

CMIIW

cheers

Klik tanda + dpojok kanan atas

THANKS!!! :p wkwkwk \(•˙▽˙•)/

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