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Chapter 1: Q1DQ (page 57)
Does the speedometer of a car measure speed or velocity? Explain.
A speedometer will only measure the car鈥檚 speed and not the car鈥檚 velocity.
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How many nanoseconds does it take light to travel 1.00 ft in vacuum? (This result is a useful quantity to remember.)?
In describing the size of a large ship, one uses such expressions as 鈥渋t displaces 20,000 tons.鈥� What does this mean? Can the weight of the ship be obtained from this information?
For the hydraulic lift shown in Fig. 12.7, what must be the ratio of the diameter of the vessel at the car to the diameter of the vessel where the force F1 is applied so that a 1520-kg car can be lifted with a force F1 of just 125 N?
Can you find a vector quantity that has a magnitude of zero but components that are not zero? Explain. Can the magnitude of a vector be less than the magnitude of any of its components? Explain.
A Fast Pitch. The fastest measured pitched baseball left the pitcher鈥檚 hand at a speed of . If the pitcher was in contact with the ball over a distance ofand produced constant acceleration, (a) what acceleration did he give the ball, and (b) how much time did it take him to pitch it?
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