Ohio state fans are the worst. They do not care about the traffic laws in Chicago. One of them drives through a stop sign at 13.3 m/s, and only slams on the brakes exactly as they pass the stop sign. Their breakers will stop there car with an acceleration of -2.21 m/s^2. How many meters in length are the tire skid marks? Please provide the variable, number, and unit e. g., a= 1.34 m/s^2

Athin electrical heater is inserted between a long circular rod and a concentric tube with inner and outer radii of 20 and 40 mm. the rod (a) has a thermal conductivity of ka = 0.15 w/(m*k), while the tube (b) has a thermal conductivity of kb = 0.8 w/(m*k) and its outer surface is subjected to convection with a fluid of temperature t= -15°c and heat transfer coefficient 60 w/(m2 *k). the thermal contact resistance between the cylinder surfaces and the heater is negligible. (a) determine the electrical power per unit length of the cylinders (w/m) that is required to maintain the outer surface of cylinder b at 15°c. (b) what is the temperature at the center of cylinder a?