Answer Happy

Disturbed by speeding cars outside his workplace, Nobel laureate Arthur Holly Compton designed a speed bump (called the "Holly hump") and had it installed. Suppose a 1800-kg car passes over a hump in a roadway that follows the arc of a circle of radius 181.2 m as in the figure below. (a) If the car travels at 28.2 km/h what force does the road exert on the car as the car passes the highest point of the hump? 383.82 magnitude Your response differs significantly from the correct answer. Rework your solution from the beginning and check each step carefully. N -Select- direction (b) What is the maximum speed the car can have without losing contact with the road as it passes this highest point? km/h
A 0.142 kg baseball has a terminal speed of 43.5 m/s (97 mi/h) (a) If a baseball experiences a drag force of magnitude Rt-C, what is the value of the constant C kg/m (b) What is the magnitude of the drag force when the speed of the baseball is 39.0 m/s? N (c) Use a computer to determine the motion of a baseball thrown vertically upward at an initial speed of 36 m/s. What maximum height does the ball reach? How long is it in the air? What is its speed just before it hits the ground? (Do this in a computer spreadsheet or programming environment. Your instructor may ask you to turn in this work.)
A penny of mass 3.10 g rests on a small 20.0 g block supported by a spinning disk with radius of 12.0 cm. The coefficients of friction between block and disk are 0.700 (static) and 0.555 (kinetic) while those for the penny and block are 0.440 (kinetic) and 0.600 (static). What is the maximum rate of rotation in revolutions per minute that the disk can have, without the block or penny sliding on the disk? rev/min 120m Rock