Chapter 12: Q57P (page 570)
Show that the potential representation (Eq. 12.133) automatically satisfies
[Suggestion: Use Prob. 12.54.]
Short Answer
The potential representation is automatically satisfied
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Chapter 12: Q57P (page 570)
Show that the potential representation (Eq. 12.133) automatically satisfies
[Suggestion: Use Prob. 12.54.]
The potential representation is automatically satisfied
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(a) Draw a space-time diagram representing a game of catch (or a conversation) between two people at rest, apart. How is it possible for them to communicate, given that their separation is spacelike?
(b) There's an old limerick that runs as follows:
There once was a girl named Ms. Bright,
Who could travel much faster than light.
She departed one day,
The Einsteinian way,
And returned on the previous night.
What do you think? Even if she could travel faster than light, could she return before she set out? Could she arrive at some intermediate destination before she set out? Draw a space-time diagram representing this trip.
A car is traveling along the line in S (Fig. 12.25), at (ordinary) speedc .
(a) Find the components Ux and Uyof the (ordinary) velocity.
(b) Find the components andof the proper velocity.
(c) Find the zeroth component of the 4-velocity, .
System is moving in the x direction with (ordinary) speed , relative to S. By using the appropriate transformation laws:
(d) Find the (ordinary) velocity components andin .
(e) Find the proper velocity components in .
(f) As a consistency check, verify that
(a) What鈥檚 the percent error introduced when you use Galileo鈥檚 rule, instead of Einstein鈥檚, withand?
(b) Suppose you could run at half the speed of light down the corridor of a train going three-quarters the speed of light. What would your speed be relative to the ground?
(c) Prove, using Eq. 12.3, that ifInterpret this result.
A cop pulls you over and asks what speed you were going. 鈥淲ell, officer, I cannot tell a lie: the speedometer read .鈥 He gives you a ticket, because the speed limit on this highway is . In court, your lawyer (who, luckily, has studied physics) points out that a car鈥檚 speedometer measures proper velocity, whereas the speed limit is ordinary velocity. Guilty, or innocent?
A car is traveling along the line in S (Fig. 12.25), at (ordinary) speed .
(a) Find the components and of the (ordinary) velocity.
(b) Find the componentsrole="math" localid="1658247416805" and of the proper velocity.
(c) Find the zeroth component of the 4-velocity, .
System is moving in the x direction with (ordinary) speed , relative to S. By using the appropriate transformation laws:
(d) Find the (ordinary) velocity components and in .

(e) Find the proper velocity components and in .
(f) As a consistency check, verify that
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