phy The largest-caliber antiaircraft gun operated by the German air force during
ID: 2117589 • Letter: P
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The largest-caliber antiaircraft gun operated by the German air force during World War II was the 12.8 cm Flak 40. Suppose this weapon fired a 27.9 kg shell with a muzzle speed of 940 m/s. What propulsive force was necessary to attain the muzzle speed within the 6.00 m barrel? (Assume the shell moves horizontally with constant acceleration and neglect friction.) A block weighing 62.5 N rests on a plane inclined at 25.0degree to the horizontal. A force F is applied to the object at 40.0degree to the horizontal, pushing it upward on the plane. The coefficients of static and kinetic friction between the block and the plane are, respectively , 0.333 and 0.156. What is the minimum value of F that will prevent the block from slipping down the plane? What is the minimum value of F that will start the block moving up the plane? What value of F will move the block up the plane with constant velocity? Disturbed b y speeding cars outside his workplace, Nobel laureate Arthur Holly Compton designed a speed bump (called the "Holly hump") and had it installed. Suppose a 1 800-k g car passes over a hump in a roadway that follows the arc of a circle of radius 18.6 m as in the figure below. If the car travels at 31.5 km/h what force does the road exert on the car as the car passes the highest point of the hump? What is the maximum speed the car can have without losing contact with the road as it passes this highest point?Explanation / Answer
1 (a) 9.88 N (b) 395.355 N (c) 125.341 N
2 (a) 10248.7 N upward (b) 48.6288 Km/hr
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