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Chapter 3: Q1. (page 67)
One car travels due east at, and a second car travels north at. Are their velocities equal? Explain.
No, their velocities are not the same because both cars have different directions.
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You are riding in an enclosed train car moving at 90 km/h. Where will the baseball land if you throw it straight upward?
(a) In front of you
(b) Behind you
(c) On your hand
(d) Can’t be decided from the given information
An airplane, whose airspeed is 580 km/h, is supposed to fly in a straight pathN of E. However, a steady 82 km/h wind is blowing from the north. In what direction should the plane head? [Hint: Use the law of sines, Appendix A-7.]
Can the displacement vector for a particle moving in two dimensions be longer than the length of the path traveled by the particle over the same time interval? Can it be less? Discuss.
Huck Finn walks at a speed of 0.70 m/s across his raft (that is, he walks perpendicular to the raft’s motion relative to the shore). The heavy raft is traveling down the Mississippi River at a speed of 1.50 m/s relative to the river bank (Fig. 3–42). What is Huck’s velocity (speed and direction) relative to the river bank?
FIGURE 3-42Problem 39
It was reported in world war I that a pilot flying at an altitude of 2 km caught in his bare hands a bullet fired at the plane! Using the fact that a bullet slows down considerably due to air resistance, explain how this incident occurred.
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