(a) Number Units (b) Number Units (c) Number Units (d) Number Units Answer a1: t

Question

(a)

Number

Units

(b)

Number

Units

(c)

Number

Units

(d)

Number

Units

Answer a1: the tolerance is +/-2%
Answer b1: the tolerance is +/-2%
Answer c1: the tolerance is +/-2%
Answer d1: the tolerance is +/-2%

Chapter 2, Problem 58 A person who walks for exercise produces the position-time graphshown. Calculate the average velocity, including sign, for(a) segment A, (b)segment B, (c) segment C, and(d) segment D.

(a)

Number

Units

kmkm/hkm/h^2m/s^2daysyears

(b)

Number

Units

kmkm/hkm/h^2m/s^2daysyears

(c)

Number

Units

kmkm/hkm/h^2m/s^2daysyears

(d)

Number

Units

kmkm/hkm/h^2m/s^2daysyears

Answer a1: the tolerance is +/-2%
Answer b1: the tolerance is +/-2%
Answer c1: the tolerance is +/-2%
Answer d1: the tolerance is +/-2%

Explanation / Answer

Velocity = distance traveled / time The distance traveled is given by the final position - initialposition The time is given by the final time - initial time a.) Velocity = d / t       d = 1.25 -0             t = .2 - 0 Velocity = 1.25 / .2 = 6.25 km / h b.) Velocity = d / t       d = .5 - 1.25=-.75            t = .4 - .2 = .2 Velocity = -.75 / .2 = -3.75 km / h c.) Velocity = d / t       d = .75 - .5 =.25           t = .8-.4 = .4 Velocity = .25 / .4 = .625 km / h d.) Velocity = d / t       d = .75 - .75= 0           t =1 - .8 Velocity = 0 / .8 = 0 km / h

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