Log out Go to App
Go to App

Learning Materials

Features

Discover

Chapter 1: Q2CP (page 6)

(a) Which of the following do you see moving with constant velocity? (1) A ship sailing northeast at a speed of 5 meters per second (2) The Moon orbiting the Earth (3) A tennis ball traveling across the court after having been hit by a tennis racket (4) A can of soda sitting on a table (5) A person riding on a Ferris wheel that is turning at a constant rate. (b) In which of the following situations is there observational evidence for significant interaction between two objects? How can you tell? (1) A ball bounces off a wall with no change in speed. (2) A baseball that was hit by a batter flies toward the outfield. (3) A communications satellite orbits the Earth. (4) A space probe travels at constant speed toward a distant star. (5) A charged particle leaves a curving track in a particle detector.

Short Answer

Expert verified

(a) Only (1) and (4) parts are the cases where the bodies are moving with constant velocities.

(b) Observational evidence for significant interaction is present in parts (1),(2),(3)and(5) .

Step by step solution

01

Understanding the concept of constant velocity

A body is said to be in constant velocity when its speed, as well as direction, is constant.

If any of the above conditions is not satisfied, the body is said to be having variable velocity.

If the body is not having constant velocity, it can be concluded that it is having significant interactions with the surroundings.

02

Analyzing each statement in part (a)

(1) When the ship is sailing at a speed of 5 meters per second in northeast direction, its speed and direction of movement is constant. Hence, its velocity is constant.

(2) In this case, the moon is orbiting the Earth. Clearly, its direction of motion is changing every second. Hence, its velocity is not constant.

(3) After the ball is hit by the tennis racket, its speed will change. Its direction would also change when it travels through the court. Hence, its velocity is not constant.

(4) The can of soda is sitting on a table. It is in a rest state. The resting state is a special case of uniform motion. Hence, its velocity is constant.

(5) The Ferris wheel is turning at a constant speed, but its direction is changes every second. Hence, its velocity is not constant.

Thus, out of all the given cases, only (1) and (4) are the cases of constant velocity.

03

Analyzing each statement in part (b)

(1) After hitting the wall, its direction will get reversed. So, you can tell that its velocity is changing. Hence, there is significant interaction.

(2) Both the direction and speed of the ball will change when it is hit by the batter. Hence, there is significant interaction between the ball and the bat.

(3) Since, the satellite orbits the earth, it moves in a circular path. Its velocity is constantly changing due to changes in direction. So, it interacts with its surroundings.

(4) In this case, the speed and direction both are constant. So, there is no interaction with the surrounding.

(5) Its direction is changing. So, there is interaction with the surroundings.

Thus, out of all the given cases, (1),(2),(3)and(5) had significant evidence to prove there was the interaction between two bodies.

Unlock Step-by-Step Solutions & Ace Your Exams!

  • Full Textbook Solutions

    Get detailed explanations and key concepts

  • Unlimited Al creation

    Al flashcards, explanations, exams and more...

  • Ads-free access

    To over 500 millions flashcards

  • Money-back guarantee

    We refund you if you fail your exam.

Start your free trial

Over 30 million students worldwide already upgrade their learning with Vaia!

One App. One Place for Learning.

All the tools & learning materials you need for study success - in one app.

Get started for free

Most popular questions from this chapter

In the periodic table on the inside front cover of this book (or one you find on the internet), for each element there is given the "atomic number," the number of protons or electrons in an atom, and the "atomic mass," which is essentially the number of nucleons, protons plus neutrons, in the nucleus, averaged over the various isotopes of the element, which differ in the number of neutrons. Make a graph of the number of neutrons vs. the number of protons in the elements. You needn't graph every element, just enough to see the trend. What do you observe about the data? (This reflects the need for more neutrons in proton-rich nuclei in order to prevent the electric repulsion of the protons of each other from destroying the nucleus.)

9 An ice hockey puck of mass 170 g enters the goal with a momentum of ⟨0, 0, −6.3⟩ kg m/s, crossing the goal line at location ⟨0, 0,−26⟩ m relative to an origin in the center of the rink. The puck had been hit by a player 0.4 s before reaching the goal. What was the location of the puck when it was hit by the player, assuming negligible friction between the puck and the ice? (Note that the ice surface lies in the xz plane.)

What is the velocity of a 3 kg object when its momentum is 20,50,-10m/s?

What is the momentum of an electron travelling at a velocity of 0,0,-2×108m/s? (Masses of the particles are given on the inside back cover of this textbook.) What is the magnitude of the momentum of the electron?

Question: A car moves along a straight road. It moves at a speed of 50 km/h for 4 minutes, then during 4 minutes it gradually speeds up to 100 km/h, continues at this speed for 4 minutes, then during 4 minutes gradually slows to a stop. Make a sketch like the figures in Section 1.2, marking dots for the position along the road every minute.
See all solutions

Recommended explanations on Physics Textbooks

Magnetism and Electromagnetic Induction

Read Explanation

Medical Physics

Read Explanation

Famous Physicists

Read Explanation

Magnetism

Read Explanation

Electricity

Read Explanation

Oscillations

Read Explanation
View all explanations

What do you think about this solution?

We value your feedback to improve our textbook solutions.

Study anywhere. Anytime. Across all devices.

Sign-up for free