Conceptual Physical Science Explorations
Conceptual Physical Science Explorations
2nd Edition
ISBN: 9780321567918
Author: Paul G. Hewitt, Leslie A. Hewitt, John A Suchocki
Publisher: Addison Wesley
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Textbook Question
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Chapter 2, Problem 3TE

If the speedometer of a car reads a constant speed of 50 km/h , can you say that the car has a constant velocity? Why or why not?

Expert Solution & Answer
Check Mark
To determine

To-determine: Whether the car has a constant velocity or not, when the speedometer of a car reads a constant speed of 50km/h.

Answer to Problem 3TE

When the speedometer of a car reads a constant speed of 50km/h , it doesn’t mean that the velocity of car is constant because the direction of car can vary.

Explanation of Solution

The velocity is a quantity that provides magnitude as well as direction, whereas the quantity speed only gives magnitude. When the speedometer of the car reads a constant speed, it doesn’t mean that the car has constant velocity. It is because the direction of the car can vary while the magnitude is consistent. The speed as well as the direction, both should be constant to gain a constant velocity. So, even a car has a constant speed, and the direction can change, which will result in a change in velocity.

Conclusion:

Therefore, when the speedometer of a car reads a constant speed of 50km/h , it doesn’t means that the velocity of car is constant because the direction of car can vary.

Chapter 2 Solutions

Conceptual Physical Science Explorations

Ch. 2 - When only a pair of equal and opposite forces act...Ch. 2 - We’ve learned that velocity is a vector quantity....Ch. 2 - Name the force that occurs in a rope when both...Ch. 2 - How much tension is there in a rope that holds a...Ch. 2 - What is the meaning of F=0?Ch. 2 - Why is the support force on an object often called...Ch. 2 - When you weigh yourself, are you actually reading...Ch. 2 - Give an example of something moving when a net...Ch. 2 - If we push a crate at constant velocity, how do we...Ch. 2 - If you’re in a smooth-riding bus that is going at...Ch. 2 - Calculate Emily’s average walking speed when she...Ch. 2 - Calculate your average speed if you run 100 meters...Ch. 2 - Calculate the average speed of a mouse who runs...Ch. 2 - Calculate the speed of a bowling ball that moves 8...Ch. 2 - Jogging Johnny runs along a train flatcar that...Ch. 2 - A track is made of a piece of channel metal bent...Ch. 2 - A block of iron is suspended by ropes in the...Ch. 2 - Galileo found that a ball rolling down one incline...Ch. 2 - Correct your friend who says, "The race-car driver...Ch. 2 - If the speedometer of a car reads a constant speed...Ch. 2 - A hungry mosquito watches you resting in a hammock...Ch. 2 - If a huge bear were chasing you, its enormous mass...Ch. 2 - A space probe may be carried by a rocket into...Ch. 2 - Consider a ball at rest in the middle of a toy...Ch. 2 - Why do you lurch forward in a bus that suddenly...Ch. 2 - Push a shopping cart and it moves. When you stop...Ch. 2 - When your car moves along the highway at constant...Ch. 2 - Consider a pair of parallel forces, one having a...Ch. 2 - The sketch shows a painting scaffold in mechanical...Ch. 2 - A different scaffold that weighs 300N supports two...Ch. 2 - Nellie Newton hangs at rest from the ends of the...Ch. 2 - Harry the painter swings year after year from his...Ch. 2 - Latisha stands on a bathroom scale and reads her...Ch. 2 - A child learns in school that Earth is travelling...Ch. 2 - If you toss a coin straight upward while riding in...Ch. 2 - As Earth rotates about its axis, it takes 3 hours...Ch. 2 - A tennis ball travels the full length of the...Ch. 2 - What is your average speed if you run 50m in 10s?...Ch. 2 - Find the net force produced by a 30-N and 20-N...Ch. 2 - A horizontal force of 100N is required to push a...Ch. 2 - Phil Physicer weighs 600N(132lb) and stands on two...Ch. 2 - Aristotle distinguished between natural motion and...Ch. 2 - The difference between speed and velocity most...Ch. 2 - The first scientist to discover the concept of...Ch. 2 - According to Newtons first law of motion (a)...Ch. 2 - A ball rolling along a bowling alley moves at...Ch. 2 - If your textbook is pulled to the right with while...Ch. 2 - The equilibrium rule, F=0 , applies to (a) objects...Ch. 2 - When you stand on two bathroom scales, one foot on...Ch. 2 - If you push your desk along the floor with a force...Ch. 2 - Suppose you stand on the floor of a train moving...
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