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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?

Short Answer

Expert verified

The bird takes 0.14 h to fly 3.5 km.

Step by step solution

01

Step 1. Relation between distance, time, and speed

The speed of an object is defined as the rate of change of position of an object in unit time. The speed of an object can be calculated as the distance traveled divided by the time taken.

Given data.

The average flying speed of the bird is v=25kmh.

The traveled distance of the bird is Δx=3.5km.

The expression for the time taken by an object is

Δt=Δxv.

Here, Δtis the time taken for the change in position, Δxis the distance traveled, and V is the speed of the object.

02

Step 2. Calculation of the time

Substituting the known values in the above expression,

Δt=3.5km25kmh=0.14h

Therefore, the bird takes 0.14 h to fly 3.5 km.

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Most popular questions from this chapter

A baseball is seen to pass upward by a window with a vertical speed of 14 m/s. If the ball was thrown by a person 18 m below on the street, (a) what was its initial speed, (b) what altitude did it reach, (c) when was it thrown, and (d) when does it reach the street again?

If one object has a greater speed than a second object, does the first necessarily have a greater acceleration? Explain, using examples.

A ball player catches a ball 3.4 s after throwing it vertically upward. With what speed did he throw it, and what height did it reach?

In a putting game, the force with which a golfer strikes a ball is planned so that the ball will stop within some small distance of the cup, say 1.0 m long or short, in case the putt is missed. Accomplishing this from an uphill lie (that is, putting the ball downhill, see Fig. 2–47) is more difficult than from a downhill lie. Assume that on a particular green, the ball constantly decelerates at1.8m/s2going downhill and at2.6m/s2going uphill to see why. Suppose you have an uphill lie 7.0 m from the cup. Calculate the allowable range of initial velocities you may impart to the ball so that it stops in the range 1.0 m short to 1.0 m long of the cup. Do the same for a downhill lie 7.0 m from the cup. What, in your results, suggests that the downhill putt is more difficult?

FIGURE 2-47 Problem 70

You travel from point A to point B in a car moving at a constant speed of 70km/h. Then you travel the same distance from point B to another point C, moving at a constant speed of 90km/h. Is your average speed for the entire trip from A to C, equal to 80km/h? Explain why or why not.
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