* 22. An 830-kg race car can drive around an unbanked turn at
a maximum speed of 58 m/s without slipping. The turn has a radius
of curvature of 160 m. Air flowing over the car's wing exerts a
downward-pointing force (called the downforce) of 11 000 N on the
car. (a) What is the coefficient of static friction between the track
and the car's tires? (b) What would be the maximum speed if no
downforce acted on the car?

Total solidification times of three casting geometries are to be compared: a sphere, a cylinder, in which the length-to-diameter ration - 1.0, and a cube. volume = 1000 cm^3 for all three shhapes, and the same casting alloy is used. a) determine the solidification times of each geometry b) based on the results of part (a), which geometric element would make the best riser? c) if the mold constant = 3.5 min/cm^2 in chvorinov's rule, compute the total solidification time for each casting.

An automobile steering wheel is shown. what is the ideal mechanical advantage? if the ama is 8, what is the efficiency of the steering wheel?

1. jay fills a wagon with sand (about 20 kg) and pulls it with a rope 30 m along the beach. he holds the rope 25° above the horizontal. the rope exerts a 20-n tension force on the wagon. how much work does the rope do on the wagon?