11. Figure below shows a lift pump. a) Name the valve that opens and the one that closes when the piston is pulled upwar Opens \( \qquad \)
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A valve in the cylinder shown in Fig. $\mathrm{P} 2.47$ has a cross-sectional area of $11 \mathrm{cm}^{2}$ with a pressure of $735 \mathrm{kPa}$ inside the cylinder and $99 \mathrm{kPa}$ outside. How large a force is needed to open the valve?
An operator makes 15 complete cycles in a 15-second interval using the hand pump shown in the figure below. Each complete cycle consists of two pump strokes (intake and power). The pump has a piston diameter of 30 mm, and the load cylinder has a piston diameter of 150 mm. The average hand force is 100 N during each power stroke. Hand force Pump piston Check valve 2 Check valve 1 Load cylinder Bleed valve How much load can be lifted (N)? How many cycles are required to lift the load by 500 mm, assuming no oil leakage? The pump piston has a 20 mm stroke. What is the output power assuming 80% efficiency?
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