UNIVERSITY PHYSICS UCI PKG
UNIVERSITY PHYSICS UCI PKG
11th Edition
ISBN: 9781323575208
Author: YOUNG
Publisher: PEARSON C
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Chapter 37, Problem 37.1DQ

You are standing on a train platform watching a high-speed train pass by. A light inside one of the train cars is turned on and then a little later it is turned off. (a) Who can measure the proper time interval for the duration of the light: you or a passenger on the train? (b) Who can measure the proper length of the train car: you or a passenger on the train? (c) Who can measure the proper length of a sign attached to a post on the train platform: you or a passenger on the train? In each case explain your answer.

(a)

Expert Solution
Check Mark
To determine

Whether passenger on train or observer in platform measures Proper time

Explanation of Solution

The relative velocity between passenger and train is zero, time measured by passenger in train is the proper time.

Conclusion: The time measured from frame where the relative velocity between two events is zero is called the proper time. Proper time is measured from frame where there is no relative motion between events.

(b)

Expert Solution
Check Mark
To determine

Passenger on train or observer in platform measures the proper length.

Explanation of Solution

The Proper length is the length measured by observer at rest in his own frame. The relative velocity between passenger and train is zero, time measured by passenger in train is the proper time Since the passenger in train is at rest in his own frame, he can measure proper length of train Since the sign is attached to ground ,relative velocity between observer in platform and ground is zero, he measures the proper length of sign.

Conclusion: Proper length is measured from frame where there is no relativity between events.

(c)

Expert Solution
Check Mark
To determine

Whether observer on platform or passenger on train measures proper length of sign post attached to ground.

Explanation of Solution

The time measured from frame where the relative velocity between two events is zero is called the proper time. The relative velocity between observer on platform and sign post is zero, time measured by observer on platform is the proper time.

Conclusion: Proper length is measured from frame where there is no relative motion between events.

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02:16

Chapter 37 Solutions

UNIVERSITY PHYSICS UCI PKG

Ch. 37 - A spaceship is traveling toward the earth from the...Ch. 37 - The average life span in the United States is...Ch. 37 - Prob. 37.6DQCh. 37 - Two events occur at the same space point in a...Ch. 37 - A high-speed train passes a train platform. Larry...Ch. 37 - Prob. 37.9DQCh. 37 - A student asserts that a material particle must...Ch. 37 - The speed of light relative to still water is 2.25...Ch. 37 - Prob. 37.12DQCh. 37 - Prob. 37.13DQCh. 37 - Why do you think the development of Newtonian...Ch. 37 - What do you think would be different in everyday...Ch. 37 - Suppose the two lightning bolts shown in Fig....Ch. 37 - The positive muon (), an unstable particle, lives...Ch. 37 - How fast must a rocket travel relative to the...Ch. 37 - A spaceship flies past Mars with a speed of 0.985c...Ch. 37 - The negative pion () is an unstable particle with...Ch. 37 - As you pilot your space utility vehicle at a...Ch. 37 - A spacecraft flies away from the earth with a...Ch. 37 - An alien spacecraft is flying overhead at a great...Ch. 37 - A spacecraft of the Trade Federation rites past...Ch. 37 - A meter stick moves past you at great speed. Its...Ch. 37 - Why Are We Bombarded by Muons? Muons are unstable...Ch. 37 - An unstable particle is created in the upper...Ch. 37 - As measured by an observer on the earth, a...Ch. 37 - A rocket ship flies past the earth at 91.0% of the...Ch. 37 - An observer in frame S is moving to the right...Ch. 37 - Space pilot Mavis zips past Stanley at a constant...Ch. 37 - A pursuit spacecraft from the planet Tatooine is...Ch. 37 - An enemy spaceship is moving toward your...Ch. 37 - Two particles are created in a high-energy...Ch. 37 - Two particles in a high-energy accelerator...Ch. 37 - Two particles in a high-energy accelerator...Ch. 37 - An imperial spaceship, moving at high speed...Ch. 37 - Tell It to the Judge. (a) How fast must you be...Ch. 37 - Electromagnetic radiation from a star is observed...Ch. 37 - A source of electromagnetic radiation is moving in...Ch. 37 - Relativistic Baseball. Calculate the magnitude of...Ch. 37 - A proton has momentum with magnitude p0 when its...Ch. 37 - When Should You Use Relativity? As you have seen,...Ch. 37 - Prob. 37.29ECh. 37 - An electron is acted upon by a force of 5.00 1015...Ch. 37 - What is the speed of a particle whose kinetic...Ch. 37 - If a muon is traveling at 0.999c, what are its...Ch. 37 - A proton (rest mass 1.67 1027 kg) has total...Ch. 37 - (a) How much work must be done on a particle with...Ch. 37 - An Antimatter Reactor. When a particle meets its...Ch. 37 - Electrons are accelerated through a potential...Ch. 37 - A particle has rest mass 6.64 1027 kg and...Ch. 37 - Creating a Particle. Two protons (each with rest...Ch. 37 - Compute the kinetic energy of a proton (mass 1.67 ...Ch. 37 - What is the kinetic energy of a proton moving at...Ch. 37 - (a) Through what potential difference does an...Ch. 37 - Prob. 37.42ECh. 37 - After being produced in a collision between...Ch. 37 - Inside a spaceship flying past the earth at...Ch. 37 - The starships of the Solar Federation are marked...Ch. 37 - A cube of metal with sides of length a sits at...Ch. 37 - A space probe is sent to the vicinity of the star...Ch. 37 - A muon is created 55.0 km above the surface of the...Ch. 37 - The Large Hadron Collider (LHC). Physicists and...Ch. 37 - The net force F on a particle of mass m is...Ch. 37 - Everyday Time Dilation. Two atomic clocks are...Ch. 37 - The distance to a particular star, as measured in...Ch. 37 - CP erenkov Radiation. The Russian physicist P A....Ch. 37 - Prob. 37.54PCh. 37 - CP A nuclear bomb containing 12.0 kg of plutonium...Ch. 37 - In the earths rest frame, two protons are moving...Ch. 37 - In certain radioactive beta decay processes, the...Ch. 37 - Two events are observed in a frame of reference S...Ch. 37 - One of the wavelengths of light emitted by...Ch. 37 - Albert in Wonderland. Einstein and Lorentz, being...Ch. 37 - Measuring Speed by Radar. A baseball coach uses a...Ch. 37 - Prob. 37.62PCh. 37 - CP In a particle accelerator a proton moves with...Ch. 37 - CP The French physicist Armand Fizeau was the...Ch. 37 - DATA As a research scientist at a linear...Ch. 37 - Prob. 37.66PCh. 37 - DATA You are a scientist studying small aerosol...Ch. 37 - CP Determining the Masses of Stars. Many of the...Ch. 37 - CP Kaon Production. In high-energy physics, new...Ch. 37 - Prob. 37.70CPCh. 37 - An airplane has a length of 60 m when measured at...Ch. 37 - If the airplane of Passage Problem 37.71 has a...Ch. 37 - In our universe, the rest energy of an electron is...Ch. 37 - In the alternate universe, how fast must an object...
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Length contraction: the real explanation; Author: Fermilab;https://www.youtube.com/watch?v=-Poz_95_0RA;License: Standard YouTube License, CC-BY