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Chapter 2: Q1P (page 32)
Question: While driving a car at 90 km/hr , how far do you move while your eyes shut for during a hard sneeze?
Answer
The distance covered while eyes shut for 0.5 s during a hard sneeze is 13 m .
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Figure shows a general situation in which a stream of people attempts to escape through an exit door that turns out to be locked. The people move toward the door at speed , are each d=0.25 m in depth, and are separated by L=1.75 m. The arrangement in figure 2-24 occurs at time t=0. (a) At what average rate does the layer of people at door increase? (b) At what time does the layer鈥檚 depth reach 5 m? (The answers reveal how quickly such a situation becomes dangerous)
Figure 2-24Problem 8
A ball is shot vertically upward from the surface of another planet. A plot of y vs t for the ball is shown in Fig 2-36, where y is the height of the ball above its starting point and t=0 at the instant the ball is shot. The figure鈥檚 vertical scaling is set by . What are the magnitudes of (a) the free fall acceleration on the planet and (b) the initial velocity of the ball?
In figure, a red car and a green car, identical except for the color, move toward each other in adjacent lanes and parallel to x axis. At time t=0, the red car is atand green car is at . If the red car has constant velocity of 20 km/hr, the cars pass each other atx = 44.5 m, and if it has a constant velocity of40 km/hr, they pass each other atx = 76.6 m. What are (a) the initial velocity? (b) the constant acceleration of the green car?
Water drips from the nozzle of a shower onto the floor below. The drops fall at regular (equal) intervals of time, the first drop striking the floor at the instant the fourth drop begins to fall. When the first drop strikes the floor, how far below the nozzle are the (a) second and (c) third drops?
The 1992 world speed record for a bicycle (human powered vehicle) was set by Chris Huber. His time through the measured 200 m stretch was a sizzling 6.509 sec , at which he commented 鈥淐ogito ergo zoom!鈥� (I think, therefore I go fast). In 2001, Sam Whittingham beat Huber鈥檚 record by 19.0 km/h. What was Whittingham鈥檚 time through the 200 m?
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