A police officer in a patrol car parked in a 100 kph speed zone observes a passing automobile travelling at a slow constant speed. Believing that the driver of the automobile might be intoxicated, the officer starts his car, accelerates uniformly from 140 kph in 8 sec. and maintaining a constant velocity of 140 kph, overtakes the motorist 42 sec. after the automobile passed him. Knowing that 8 sec. elapsed before the officer began pursuing the motorist. (a) Determine the acceleration of the officer's car. (b) Determine the distance the officer travelled before overtaking the motorist. (C) Determine the motorist speed.

A 50-cm-diameter pipeline in the Arctic carries hot oil at 30°C and is exposed to a surrounding temperature of - 20 degrees * C A special powder insulation 5 cm thick surrounds the pipe and has a thermal conductivity of 7 mW/m °C. The convection heat-transfer coefficient on the outside of the pipe is 9 W / (m ^ 2) °C. Estimate the energy loss from the pipe per meter of length.

1. At an intersection car A was traveling south and car B was traveling 35° north of east when they slammed into each other. Upon investigation it was found that after the crash the two cars got stuck and skidded off at an angle of 15° north of east. Each driver claimed that he was going at the speed limit of 60 km/h and that he tried to slow down but couldn't avoid the crash because the other driver was going a lot faster. Knowing that the masses of cars A and B were 1000 kg and 1200 kg, respectively, determine (a) which car was going faster, (b) the speed of the faster of the two cars if the slower car was traveling at the speed limit. شکایت VB N 135⁰ B A V 15°