1) A 1500 kg automobile travels at a speed of 80 km/h along a straight concrete highway. Faced with an emergency situation, the driver jams on the brakes, and the car skids to a stop.
(a) What will be the car's stopping distance for dry pavement (µ = 0.85)?
(b) What will be the car's stopping distance for wet pavement (µ = 0.60)?
2) The coefficients of static and kinetic friction between a 53 kg box and a horizontal surface are 0.70 and 0.19, respectively.
(a) What is the acceleration of the object if a 270 N horizontal force is applied to the box?
(b) What is the acceleration if the applied force is 430 N?