Adriver is traveling at 90 mi/h down a 3% grade on good, wet pavement. an accident investigation team noted that braking skid marks started 410 ft before a parked car was hit at an estimated 45 mi/h. gnoring air resistance, and using theoretical stopping distance, what was the braking efficiency of the car? (mannering 53) mannering, fred l., scott washburn. principles of highway engineering and traffic, 6th edition. wiley, 2016- 09-15. vitalbook file. the citation provided is a guideline. check each citation for accuracy before use. (ans: 8896; hint for fri, use average speed)

At 12 noon, the count in a bacteria culture was 400; at 4: 00 pm the count was 1200 let p(t) denote the bacteria cou population growth law. find: (a) an expression for the bacteria count at any time t (b) the bacteria count at 10 am. (c) the time required for the bacteria count to reach 1800.

Machinery that is a key part of the process and without which the plant or process cannot function is classifed as: (clo4) a)-critical machinery b)-essential machinery c)-general purpose machinery d)-none of the specified options.

Along 8-cm diameter steam pipe whose external surface temperature is 900c connects two buildings. the pipe is exposed to ambient air at 70c with a wind speed of 50 km/hr blowing across the pipe. determine the heat loss from the pipe per unit length. (b) air at 500c enters a section of a rectangular duct (15 cm x 20 cm) at an average velocity of 7 m/s. if the walls of the duct are maintained at 100c. a) the length of the tube for an exit temperature of the air to be 40 0c. b)the rate of heat transfer from the air. c) the fan power needed to overcome the pressure drop in this section of the duct.