An object is accelerating if it moves
1) with constant velocity
2) in a circular path
3) in a straight-line path
because it is undergoing a change in its
4) speed.
5) direction.
6) net force.
Answer: 2, 5
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A nearsighted person has a near point of 12. cm and a far point of 17. cm. If the lens is 2.0 cm from the eye:
(a) what lens power will enable this person to see distant objects clearly? (b) what then will be the new near point?
A 75-N box rests on a perfectly smooth horizontal surface. The minimum force need to start the box moving is
A) 75 N. B) 7.5 N. C) 750 N. D) any horizontal force greater than zero.
A(n) ______________ converts electrical energy into mechanical energy
Fill in the blank(s) with correct word
A 0.14-kg baseball is dropped from rest from a height of 2.0 m above the ground. What is the magnitude of its momentum just before it hits the ground if we neglect air resistance?
A) 0.28 kg ? m/s B) 0.88 kg ? m/s C) 0.44 kg ? m/s D) 0.62 kg ? m/s E) 1.4 kg ? m/s