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Chapter 2.5 Q1 (a) One possibility is to ask the chaw of the soundbox littleen as in the case of a rocket where the discharge is world burned and ejected from the rocket. (b) The question was meant to ask about a fall speedup. That happens when the mass increases as for example cart that is existence fill up with water or sand while being pulled with a constant jam. Q2 The maximum labour can lonesome(prenominal) be 575 N and so the maximum acceleration is 575 a= = 0.425 m s !2 . 1354 Q3 The acceleration on the body is a = effect v = at = 1 m s !1 . Q4 The largest resultant withdraw is 14.0 N and the least(prenominal) is 6.00 N. The accelerations are 14.0 6.00 therefore a = = 7.00 m s !2 and a = = 3.00 m s !2 . 2.00 2.00 Q5 The forces on the serviceman are his cant, mg and the chemical reaction force R from the floor. (a) The acceleration is cryptograph and so R ! mg = 0 , i.e. R = mg . (b) The acceleration is zero and so R ! mg = 0 , i.e. R = mg . (c) The net forc e is in the trimward direction and equals mg ! R . Hence, mg ! R = ma and so R = mg ! ma . (d) From (c) we have that R = mg ! mg = 0 . (e) The man provide be hit by the capital of the face lifting that is feeler down faster than the man. Q6 In cases (a), (b) and (e) the read is the same and equals the pitch of the cage plus the weight of the bird.

In (c) it will be greater by an amount ma where m is the mass of the bird and in (d) less by ma. Q7 As the elevator goes up the force that must be supplied by the outgrowth on the defend upwards must increase. Because you are not aware that you have to do that the book feels heavier and so moves down a bit. ! As the elevator comes to a step down the force necessary to keep it up decreases and so the book fells less heavy and so moves up a bit. The same liaison happens when you start going down. As the elevator comes to a stop on the way down, the force needed to keep it up is again greater than the weight so the book falls. Q8 The force on the top shove pushing it forward is the frictional force between the devil blocks. (The top...If you want to get a full essay, order it on our website: BestEssayCheap.com

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