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Chapter 2: Q1. (page 41)

Does a car speedometer measure speed, velocity, or both? Explain.

Short Answer

Expert verified

The speedometer measures only the speed of the car.

Step by step solution

01

Step 1. Definitions of speed and velocity

The rate at which an object is displaced from one location to another is known as the object鈥檚 velocity. It has both direction and magnitude.

The rate of change in the object鈥檚 distance is known as the object鈥檚 speed. It has magnitude but no direction.

02

Step 2. Application of speedometer

A speedometer is a device that helps to estimate and visualize a vehicle's instantaneous speed, that has only magnitude. The speedometer does not give the direction of the vehicle.

Thus, this device can measure only the speed of a vehicle, not its velocity.

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Most popular questions from this chapter

You are driving home from school steadily at 95 km/h for 180 km. It then begins to rain, and you slow down to 65 km/h. You arrive home after driving for 4.5 h.

(a) How far is your hometown from school?

(b) What was your average speed?

A person jumps out of the fourth-story window of a building18.0 m above a firefighter鈥檚 safety net. The survivor stretches the net 1.0 m before coming to rest (Fig. 2鈥�45). (a) What is the average deceleration experienced by the survivor when she was slowed to rest by the net? (b) What would you do to make it 鈥檚afer鈥� (that is, to generate a smaller deceleration)? Would you stiffen or loosen the net? Explain.

FIGURE 2-45Problem 62

A ball is dropped from the top of a tall building. At the same instant, a second ball is thrown upward from the ground level. When the two balls pass one another, one on the way up, the other on the way down, compare the magnitudes

of their acceleration:

(a) The acceleration of the dropped ball is greater.

(b) The acceleration of the ball thrown upward is greater.

(c) The acceleration of both balls is the same.

(d) The acceleration changes during the motion, so you cannot predict the exact value when the two balls pass each other.

(e) The accelerations are in opposite directions.

A bicyclist in the Tour de France crests a mountain pass as he moves at 15 km/h. At the bottom, 4.0 km farther, his speed is 65 km/h. Estimate his average acceleration (inm/s2) while riding down the mountain.

A person jogs eight complete laps around a 400 m track in a total time of 14.5 min. Calculate (a) the average speed and (b) the average velocity in m/s.
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