# ch02 - MULTIPLECHOICE. 1 Whirlarock attheendof astringand...

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MULTIPLE CHOICE.  Choose the one alternative that best completes the statement or answers the question.  1)

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Whirl a rock  at the end of  a string and  it follows a  circular  path.  If the  string  breaks, the  tendency of  the rock is to
1)  _______  A)  c o n t i n u e   to  foll ow  cir cul ar  pat h.  f o ll ow a  straight - line path.

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A sheet of  paper can be  withdrawn  from under a  container of  milk without  toppling it if  the paper is  jerked  quickly. This  best  demonstrate s that
2)  _______  A)  t h e   m i l car ton  has  ine rtia t h e r is an  action - reaction  pair of  forces.

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gravity tends to hold the milk carton secure.  D)
the milk carton has no  acceleration.  E)

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none of these    3)
An object  maintains its  state of  motion  because it  has

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3)  _______  A)  m a ss.  s peed.
weight.  D)

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acceleration.  E)
all of these    4)

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According to  Newton's  law of  inertia, the  result of  walking  much of the  day is  similar to  tightening  the head of a  hammer  when its  handle hits a  solid surface  (Figure 2.2  in the text)  so that we  are actually  a little bit  shorter in  the
4)  _______  A)  e v eni ng.  m orning.

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no difference, really    5)
A package  falls off a  truck that is  moving at 30  m/s.  Neglecting  air  resistance,  the  horizontal  speed of the  package just  before it hits  the ground is

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5)  _______  A)  z e ro. m o re than  30 m/s.
less than 30 m/s but  larger than zero.  D)

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