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Chapter 3: Q2. (page 67)

Can you conclude that a car is not accelerating if its speedometer indicates a steady60km/h? Explain.

Short Answer

Expert verified

No, based on the speedometer reading, you cannot conclude that a car is not accelerating.

Step by step solution

01

Step 1. Definitions of velocity and acceleration

Velocity and acceleration are vector quantities. Velocity is defined as the rate of change of displacement of an object with time, and acceleration is defined as the time rate of change of velocity.

The SI units of velocity and acceleration are m/sand m/s2, respectively.

02

Step 2. Analysis of the car’s acceleration

A speedometer measures only the speed of a car. In the given case, it indicates that the car is moving at a constant speed of 60km/h. However, it does not mean that the car also has a constant velocity.

If the car travels along a curve or a winding road, its direction will change even at the same speed (60km/h). And it will also have some acceleration.

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Most popular questions from this chapter

A ball is thrown horizontally from the roof of a building 7.5 m tall and lands 9.5 m from the base. What was the ball’s initial speed?

On mountainous downhill roads, escape routes are sometimes placed to the side of the road for trucks whose brakes might fail. Assuming a constant upward slope of26o, calculate the horizontal and vertical components of the acceleration of a truck that slowed from 110 km/h to rest in 7.0 s. See Fig. 3-48.

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.

Determine the vectorA→-C→with given the vectorsA→andC→

in Fig. 3–35.

FIGURE 3-35

The magnitude of a component of a vector must be(a) less than or equal to the magnitude of the vector.(b) equal to the magnitude of the vector.(c) greater than or equal to the magnitude of the vector.(d) less than, equal to, or greater than the magnitude of the vector.
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