# Physics! - sharif(ks33723 – ap-3 momentum – newman...

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Unformatted text preview: sharif (ks33723) – ap-3 momentum – newman – (23) 1 This print-out should have 34 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. 001 10.0 points A ball of mass 0.4 kg is initially at rest on the ground. It is kicked and leaves the kicker’s foot with a speed of 5.0 m/s in a direction 60 ◦ above the horizontal. The magnitude of the impulse bardbl vector I bardbl imparted by the ball to the foot is most nearly 1. bardbl vector I bardbl = √ 3 N · s. 2. bardbl vector I bardbl = 2 √ 3 N · s. 3. bardbl vector I bardbl = 1 N · s. 4. bardbl vector I bardbl = 4 N · s. 5. bardbl vector I bardbl = 2 N · s. 002 (part 1 of 2) 10.0 points An attack helicopter is equipped with a 20- mm cannon that fires 158 g shells in the forward direction with a muzzle speed of 684 m / s. The fully loaded helicopter has a mass of 2000 kg. A burst of 160 shells is fired in a 5 . 27 s interval. What is the resulting average force on the helicopter? Answer in units of N. 003 (part 2 of 2) 10.0 points By what amount is its forward speed reduced? Answer in units of m / s. 004 10.0 points A 7 kg steel ball strikes a wall with a speed of 8 . 61 m / s at an angle of 57 . 9 ◦ with the normal to the wall. It bounces off with the same speed and angle, as shown in the figure. x y 8 . 6 1 m / s 7 kg 8 . 6 1 m / s 7 kg 57 . 9 ◦ 57 . 9 ◦ If the ball is in contact with the wall for . 108 s, what is the magnitude of the average force exerted on the ball by the wall? Answer in units of N. 005 10.0 points A barefoot field-goal kicker imparts a speed of 49 m / s to a football initially at rest. If the football has a mass of 0 . 38 kg and the time of contact with the ball is 0 . 035 s, what is the force exerted by the ball on the kicker’s foot? Answer in units of N. 006 10.0 points The linear impulse delivered by the hit of a boxer is 247 N · s during the 0 . 304 s of contact. What is the magnitude of the average force exerted on the glove by the other boxer? Answer in units of N....
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## This note was uploaded on 10/10/2010 for the course PHYSICS 2325 taught by Professor Soumyamohanty during the Spring '10 term at University of Texas at Dallas, Richardson.

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Physics! - sharif(ks33723 – ap-3 momentum – newman...

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