Biology Forums - Study Force

A jogger runs halfway around a circular path with a radius of 70 m. What, respectively, are the magnitude of the displacement and the distance jogged?
 a. 70 m, 220 m
  c. 140 m, 220 m
  b. 70 m, 440 m
  d. 140 m, 440 m

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[Ques. 2] Arvin the Ant is on a picnic table. He travels 30 cm eastward, then 20 cm northward, and finally 15 cm westward. What is the magnitude of Arvin's net displacement?
 a. 25 cm
  c. 50 cm
  b. 65 cm
  d. 29 cm

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[Ques. 3] An object moves at a constant velocity of 12 m/s to the southwest for an interval of 20 s. Halfway through this interval, what is the magnitude of its instantaneous velocity?
 a. It can be any value from 0 to 24 m/s.
  c. 12 m/s
  b. 6 m/s
  d. More information is needed.

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[Ques. 4] A hiker walks 200 m east and then walks 100 m north. In what direction is her resulting displacement?
 a. north
  c. northeast
  b. east
  d. None of the answers is correct.

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[Ques. 5] A car is initially moving at 30 m/s east and a little while later it is moving at 10 m/s north. Which of the following best describes the orientation of the average acceleration during this time interval?
 a. north of west
  c. west
  b. northwest
  d. north of east

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[Ques. 6] An object, initially moving in the negative x direction, is subjected to a change in velocity in the negative y direction. If the resulting velocity vector is drawn from the origin, into which quadrant does this vector point?
 a. 1st
  b. 2nd
  c. 3rd
  d. None, since the object is now moving in the negative y direction.

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[Ques. 7] The first displacement is 7 m and the second displacement is 3 m. They cannot add together to give a total displacement of:
 a. 10 m.
  c. 4 m.
  b. 7 m.
  d. 3 m.

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[Ques. 8] In the case of constant acceleration, the average velocity equals the instantaneous velocity:
 a. at the beginning of the time interval.
  b. at the end of the time interval.
  c. half-way through the time interval.
  d. three-fourths of the way through the time interval.

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[Ques. 9] A bird, accelerating from rest at a constant rate, experiences a displacement of 37 m in 11 s. What is its acceleration?
 a. 0.20 m/s2
  c. 0.51 m/s2
  b. 0.31 m/s2
  d. 0.61 m/s2

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[Ques. 10] A bird, accelerating from rest at a constant rate, experiences a displacement of 37 m in 11 s. What is the final velocity after 11 s?
 a. 6.7 m/s
  c. 13 m/s
  b. 5.1 m/s
  d. zero

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