Q. finding the thermal conductivity (k) of a box with total surface area of 1.20m and a wall thickness of 4. cm is made of an insulating material. a 10.0W electric heater inside the box maintain the inside temp. at 15C above the outside temp.
Q.Two trains are traveling directly towards each other on the same track. One train is traveling at 15m/s and the other train at 21m/s. if they are 1500m apart, how long will take them to collide?