Q1. A steam pipe is covered with 1.50 cm thick insulating material of thermal conductivity 0.200 cal s"1 cm"1 °C"1. How much energy is lost per second when the steam is at 200° C and the surrounding air is at 20.0 °C? The pipe has a circumference of 800 cm and a length of 50.0 m. Ignore losses through the ends of the pipe.
Q2. A 30-06 caliber hunting rifle fires a bullet of mass 0.0146 kg with the velocity of 314 m/s to the right. The rifle has a mass of 2.49 kg.
What is the recoil speed of the rifle as the bullet leaves rifle?