May Day Strike and Mayhem. Eight hours for work, eight hours for rest and eight hours for what you will.. --A slogan of the Eight-hour Day movement. May 1, 1886, was the deadline that unions and other worker organizations set for a national general strike.
On January 31, 2008 the US Navy tested a railgun that fired a shell at 10.64 MJ with a muzzle velocity of 2,520 m/s (8,270 ft/s). Its expected performance is a muzzle velocity over 5,800 m/s (19,000 ft/s), accurate enough to hit a 5-metre (16 ft) target over 200 nmi (370 km) away while firing at 10 shots per minute.
In order to investigate the effects of the speed and length of train on the attenuation characteristics, the variations in vibration amplitude with distance are plotted in Fig. 8for two cases: (i) a saemaul express train of 8 cars with a speed of 135 km/h; and (ii) a freight train of 24 cars with a speed of 71 km/h.