After spending 2 weeks’ holiday in China, Ken buys a saloon car weighing 40 piculs in the local unit of mass: given that 1 picul = 100 gins, 1 gin = 16 tahils, 1 tahil = 10 chees and 1 chee = 12 hoons. The weight of 1 hoon corresponds to a mass of 0.4 g. How much mass in tonnes will Ken declare on the shipment of the car?

The Load and Resistance Factor Design method is to be used to select the two cables that will raise and lower a platform supporting two window washers. The platform weighs 160 lb and each of the window washers is assumed to weigh 195 lb with equipment. Since these workers are free to move on the platform, 75% of their total weight and the weight of their equipment will be used as the design live load of each cable.

(a) Assuming a resistance factor and load factor

Determine the required minimum ultimate load of one cable.

(b) What is the corresponding conventional factor of safety for the selected cables?