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Chapter 2: Q5. (page 43)
A bird can fly at 25 km/h. How long does it take to fly 3.5 km?
The bird takes 0.14 h to fly 3.5 km.
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A car traveling at 95 km/h strikes a tree. The front end of the car compresses, and the driver comes to rest after traveling 0.80 m. What was the magnitude of the average acceleration of the driver during the collision? Express the answer in terms of 鈥榞鈥檚鈥�, where 1.00 g = 9.80 m/s2.
The position of a rabbit along a straight tunnel as a function of time is plotted in Fig. 2-44. What is its instantaneous velocity (a) at t = 10.0 s and (b) at t = 30.0 s? What is its average velocity (c) between t = 0 and t = 5.0 s, (d) between t = 25.0 s and t= 30.0 s, and (e) between t = 40.0 s and t = 50.0 s.
Figure 2-44Problems 57,58 and 59
Consider the street pattern shown in Fig. 2鈥�46. Each inter-section has a traffic signal, and the speed limit is 40 km/h. Suppose you are driving from the west at the speed limit. When you are 10.0 m from the first intersection, all the lights turn green. The lights are green for 13.0 s each. (a) Calculate the time needed to reach the third stoplight. Can you make it through all three lights without stopping? (b) Another car was stopped at the first light when all the lights turned green. It can accelerate at the rate ofto the speed limit. Can the second car make it through all three lights without stopping? By how many seconds would it make it, or not make it?
FIGURE 2-46Problem 65
Describe in words the motion plotted in Fig. 2-32 in terms of velocity, acceleration, etc. [Hint: First try to duplicate the motion plotted by walking or moving your hand.]
Which of the following should be a part of solving any problem in physics? Select all that apply:
Read the problem carefully.
Draw a picture of the situation.
Write down the variables that are given.
Think about which physics principles to apply.
Determine which equations can be used to apply the correct physics principles.
Check the units when you have completed your calculation.
Consider whether your answer is reasonable.
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