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Chapter 1: Q.8 (page 28)
Is the particle in Fig. 1.3 speeding up? Slowing down? Or can you tell? Explain.
Speed is defined as the rate of change of distance over time.
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The quantity called mass density is the mass per unit volume of a substance. What are the mass densities in SI units of the following objects?
a. A 215 cm3 solid with a mass of 0.0179 kg.
b. 95 cm3 of a liquid with a mass of 77 g
a. Write a paragraph describing the particle model. What is it,
and why is it important?
b. Give two examples of situations, different from those
described in the text, for which the particle model is appropriate.
c. Give an example of a situation, different from those described in the text, for which it would be inappropriate.
Draw a pictorial representation for the following problem. Do
not solve the problem. The light turns green, and a bicyclist starts forward with an acceleration of 1.5 m/s2. How far must she travel to reach a speed of 7.5 m/s?
For Problem 40, draw a complete pictorial representation. Do not solve these problems or do any mathematics.
A motorist is traveling at 20 m/s. He is 60 m from a stoplight when he sees it turn yellow. His reaction time, before stepping on the brake, is 0.50 s. What steady deceleration while braking will bring him to a stop right at the light?
Estimate (don’t measure!) the length of a typical car. Give your answer in both feet and meters. Briefly describe how you arrived at this estimate
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