Experience of mathematical calculation training

1.

bus route: Tsuen Wan line → Hong Kong Island line, the whole journey is about 7.9km

1. Take the Tsuen Wan line from the prince, pass 5 stops, and then arrive at Admiralty Station

2. Take the Hong Kong Island line, pass 2 stops, and then arrive at Causeway Bay Station

3. Walk about 290 meters to Zhongwei commercial building

2. The pressure of the cylinder still needs to be determined according to the valve. If the valve can't bear it, how about the pressure of the cylinder itself? Generally, the valve is 3-8kg< Calculation method:
first, make a general calculation according to the rated air pressure and standard cylinder diameter
for example, the air pressure is 0.5MPa
(5.0985811 kgf / cm & # 178;), The cylinder diameter is 50 mm (5 cm), the cylinder cross-sectional area is pi * (5 / 2) ^ 2 = 19.63 (square centimeter)
therefore, the theoretical output at 0.5 MPa is 5.0985811 * 19.63 = 100.085 (KGF)
but it is only the theoretical output, and the actual efficiency will be lower according to the working conditions< The normal working pressure of common pneumatic components is 0.4 MPa, and the output pressure of the most common air compressor is 0.4-0.7 MPa. In order to push a 700kg workpiece, it is necessary to test the reasoning required, and the piston stroke should be determined according to the needs

3.

bus line: No. 112, about 4.3km in the whole journey

1. Walk about 310m from honghom subway station to entrance B1 to the undersea tunnel station

2. Take No. 112, pass 2 stops, and reach Chongguang Department Store Station (or take No. 116)

3. Walk about 50m to the east corner center

4. Take the subway to Causeway Bay station, then there is an exit to SOGO