A gun is fired and a 50-g bullet is accelerated to a muzzle speed of 100 m/s. If the length of the gun barrel is 0.90 m, what is the magnitude of the accelerating force? (Assume the acceleration to be constant.)
Answer to relevant QuestionsFig. 4.34 shows a product label. (a) This label is correct (1) on the Earth; (2) on the Moon, where the acceleration due to gravity is only one-sixth of that on the Earth; (3) in deep space, where there is little gravity; ...A student weighing 800 N crouches on a scale and suddenly springs vertically upward. His roommate notices that the scale reads 900 N momentarily just as he leaves the scale. With what acceleration does he leave the scale? A force of 10 N acts on two blocks on a frictionless surface (Fig. 4.37). (a) What is the acceleration of the system? (b) What force does block A exert on block B? (c) What force does block B exert on block A? (a) As a weightlifter lifts a barbell from the floor in the “clean” procedure (Fig. 5.25a), has he done work? Why or why not? (b) In raising the barbell above his head in the “jerk” procedure, is he doing work? ...A jet plane flies in a vertical circular loop. In what regions of the loop is the work done by the force of gravity on the plane positive negative? Is the work constant? If not, are there maximum and minimum instantaneous ...
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