A hydraulic press has a ram of 15 cm diameter and plunger of 1.5 cm. It is required to lift a mass of 1000 kg. The force required on plunger is nearly equal to
- A. 100N
- B. 1000N
- C. 10000N
- D. 10N
Answer: A. 100N
Explanation: By Archimedes principle $F_1/A_1 = F_2/A_2$. Force $F_1 = F_2(A_1/A_2) = (1000 \times 9.81) \times (1.5^2/15^2) \approx 10000 \times (1/100) = 100$ N.