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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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As an architect, you are designing a new house. A window has a height between 140 cm and 150 cm and a width between 74 cm and 70 cm. What are the smallest and largest areas that the window could be?
Determine the signs (positive, negative, or zero) of the position,
velocity, and acceleration for the particle in FIGURE Q1.8.
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 the average speed with which the hair on your head grows. Give your answer in both m/s and mm/hour. Briefly describe how you arrived at this estimate.
Figure p1.58 shows a motion diagram of a car traveling down a street. The camera took one frame every 10 s. A distance scale is provided.
a. Measure the x-value of the car at each dot. Place your data in a table, similar to Table 1.1, showing each position and the instant of time at which it occurred.
b. Make a position-versus-time graph for the car. Because you have data only at certain instants of time, your graph should consist of dots that are not connected together.
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