The alloy of steel that is used for making automobile parts such as axle, ball bearing, etc. is -
1) Nickel steel
2) Chromium steel
3) Tungsten steel
4) Stainless steel

A stainless-steel orthodontic wire is applied to a tooth, as in Figure P9.72. The wire has an unstretched length of 3.1 cm and a radius of 0.11 mm. If the wire is stretched 0.10 mm, find the magnitude and direction of the force on the tooth. Disregard the width of the tooth and assume Young’s modulus for stainless steel is 18 × 10¹⁰ Pa.

A DC motor delivers mechanical power to a rotating stainless steel shaft (k = 15.1 W/m.K) with a length of 25 cm and a diameter of 25 mm. In a surrounding with ambient air temperature of and convection heat transfer coefficient of the surface area of the motor housing that is exposed to the ambient air is . The motor uses 300 W of electrical power and delivers 55% of it as mechanical power to rotate the stainless steel shaft. If the tip of the stainless steel shaft has a temperature of , determine the surface temperature of the motor housing. Assume the base temperature of the shaft is equal to the surface temperature of the motor housing.

Water is to be boiled at sea level in a 30-cm-diameter stainless steel pan placed on top of a 3-kW electric burner. If 60 percent of the heat generated by the burner is transferred to the water during boiling, determine the rate of evaporation of water.