Tibetan mastiffs were popular in China’s imperial courts as hunting dogs. They were brought along the Silk Road in ancient times as tribute from Tibet. They were huge black dogs used as watchdogs. They exploded into action like bullets. They were furious and fearless.
Figure 8.9 shows the strain-stress curve for a given material. What are (a) Young’s modulus and (b) approximate yield strength for this material?

Two identical ball bearings in contact with each other and resting on a frictionless table are hit head-on by another ball bearing of the same mass moving initially with a speed V. If the collision is elastic, which of the following (Fig. 5.14) is a possible result after collision ?
