3. Is it possible for a body to move in a constant speed but a variablevelocity?4. When a body has a constant acceleration, does the direction of itsvelocity change or not? If yes, give one of your examples.5. If an object is acted on under several forces, does the object have tohave acceleration?6. Does the direction of the net force acted on a body and the direction ofmotion of the body have to be the same?B. Problems1. A net force of 21.6N (1N=kg•ms?) accelerates an object at 10.8 ms?.What is the mass of the object? (m = 2 kg)2. An object moves according to the equation of motion7() = (3+ 41')i + (6e +8r')+3kFind:(i). The initial position of the object; (r(0) =3 k)(ii). The velocity of the object at t=2 second and the anglewith z-axis also at t =2 s.(ii). The magnitude of its acceleration at any moment.(hint: find acceleration bydtand then using3. A force acting on an object has an angle of % with the object'sdisplacement.(i)Suppose the magnitude of the force is 4 N and the objectmoves for 2 meters under the force. Find the work done by theforce using work = [F- di . (Formula: if [ (x) dx = F(x). then[((x) dx = F(8) – F(A) , you will use [dr = r)(ii)Suppose the initial velocity of the object is zero and final speedof the object is 6 ms'. Calculate the mass of the object. (hint:the change of kinetic energy is equal to the work done by theforce and using the result in (i).)4. A particle with mass m moves around a circle of radius r. Suppose thatits angular displacement can be described by a function of8= 31 - 31 +2. Find(1)its angular velocity at t = 5 second and its tangential speed at t= 2 second; (hint: w =-, v = ra)(ii)its angular acceleration at t = 5 second and tangentiald'0 dwacceleration at t =2 second; (hint: a =a = ra)didt(ii)the magnitude of its angular momentum to the center of thecircle at t = 6 second. (hint: i= i x ë,IL= rp sin 8, eshouldbe equal to ninety degree in circular motion case)

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Answered: 1. A net force of 21.6N (1N=kg•ms*)…

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1. A net force of 21.6N (1N=kg•ms*) accelerates an object at 10.8 ms What is the mass of the object? (m 2 kg)

Physics for Scientists and Engineers

10th Edition

ISBN:9781337553278

Author:Raymond A. Serway, John W. Jewett

Publisher:Raymond A. Serway, John W. Jewett

Chapter6: Circular Motion And Other Applications Of Newton's Laws

Section: Chapter Questions

Problem 14P: An object of mass m = 5.00 kg, attached to a spring scale, rests on a frictionless, horizontal...

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