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The car-in-the-garage problem. Carman has just purchased the world鈥檚 longest stretch limo, which has a proper length of Lc=30.5鈥尘. In Fig. 37-32a, it is shown parked in front of a garage with a proper length of Lg=6.00鈥尘. The garage has a front door (shown open) and a back door (shown closed).The limo is obviously longer than the garage. Still, Garageman, who owns the garage and knows something about relativistic length contraction, makes a bet with Carman that the limo can fit in the garage with both doors closed. Carman, who dropped his physics course before reaching special relativity, says such a thing, even in principle, is impossible.

To analyze Garageman鈥檚 scheme, an xc axis is attached to the limo, with xc=0 at the rear bumper, and an xg axis is attached to the garage, with xg=0 at the (now open) front door. Then Carman is to drive the limo directly toward the front door at a velocity of 0.9980c(which is, of course, both technically and financially impossible). Carman is stationary in the xcreference frame; Garageman is stationary in the role="math" localid="1663064422721" Xgreference frame.

There are two events to consider. Event 1: When the rear bumper clears the front door, the front door is closed. Let the time of this event be zero to both Carman and Garageman: tg1=tc1=0. The event occurs at xg=xc=0. Figure 37-32b shows event 1 according to the xg reference frame. Event 2: When the front bumper reaches the back door, that door opens. Figure 37-32c shows event 2 according to the xg reference frame.

According to Garageman, (a) what is the length of the limo, and what are the spacetime coordinates (b) xg2 and (c) tg2 of event 2? (d) For how long is the limo temporarily 鈥渢rapped鈥 inside the garage with both doors shut? Now consider the situation from the xc reference frame, in which the garage comes racing past the limo at a velocity of 0.9980c. According to Carman, (e) what is the length of the passing garage, what are the spacetime coordinates (f) Xc2and (g) tc2 of event 2, (h) is the limo ever in the garage with both doors shut, and (i) which event occurs first? (j) Sketch events 1 and 2 as seen by Carman. (k) Are the events causally related; that is, does one of them cause the other? (l) Finally, who wins the bet?

Short Answer

Expert verified

(a) The length of the limo is 1.93鈥尘.

(b) The value of xg2 is 6.00鈥嬧尘.

(c) The value of tg2 of event 2 is 1.36108鈥塻.

(d) The limo was temporarily trapped for about 1.36108鈥塻.

(e) The length of the passing garage is 0.379鈥尘.

(f) The value of xc2 is 30.5鈥尘.

(g) The value of tc2 of event 2 is 1.01107鈥塻.

(h) The limo was not in the garage with both doors shut.

(i) The event 2 occurs first.

(j)and

(k) The events are not casually related.

(l) Both carman and garageman wins the bet.

Step by step solution

01

Identification of given data

The given data can be listed below as:

The length of the longest stretch limo is Lc=30.5鈥尘.

The length of the car when parked in front of the garage is Lg=6.00鈥嬧尘.

The value of the attached xc axis is xc=0.

The value of the attached xg axis is xg=0.

The velocity of the car isv=0.9980c .

The timing of the event is for Garageman and Carman is tg1=tc1=0.

The occurrence of the event is xc=xg=0.

02

Significance of the special relativity

Thespecial relativity mainly shows the relationship between the space and the time. It mainly shows that the physics laws are mainly invariant in the inertial reference frame.

03

(a) Determination of the limo’s length

The equation of the length of the limo is expressed as:

L=Lc1vc2

Here, L is the length of the limo, Lc is the length of the longest stretch limo,v is the velocity of the car andc is the speed of the light.

Substitute the values in the above equation.

L=(30.5鈥尘)10.9980cc2=(30.5鈥尘)1(0.9980)2=(30.5鈥尘)1(0.996004)=(30.5鈥尘)(0.063)=1.93鈥尘

Thus, the length of the limo is 1.93鈥尘.

04

(b) Determination of the  xg2

According to the question, the xg axis is mainly fixed with the garage. Hence, the value of the xg2 will be the length of the car when parked in front of the garage.

Thus, the value of xg2 is 6.00鈥嬧尘 .

05

(c) Determination of the   tg2 

The equation of the value of tg2 of event 2 is expressed as:

tg2=tg1+LgLv

Here, tg1 is the timing of the event is for Garageman and Carman, Lg is the length of the car when parked in front of the garage and v is the velocity of light.

Substitute the values in the above equation.

tg2=0+6.00鈥尘1.93鈥尘0.9980(3108鈥尘/s)=4.07鈥尘(2.9108鈥尘/s)=1.36108鈥塻

Thus, the value of tg2of event 2 is 1.36108鈥塻 .

06

(d) Determination of the time 

It has been identified that the lino was inside the garage in the time frame from tg1 and also tg2. Hence, the equation of the time duration is expressed as:

t=tg2tg1

Here,t is described as the time duration.

Substitute the values in the above equation.

t=1.36108鈥塻0=1.36108鈥塻

Thus, the limo was temporarily trapped for about 1.36108鈥塻.

07

(e) Determination of the length of the passing garage

The equation of the length of the passing garage is expressed as:

L1=Lg1vc2

Here, L1 is the length of the passing garage.

Substitute the values in the above equation.

L1=(6.00鈥尘)10.9980cc2=(6.00鈥尘)1(0.9980)2=(6.00鈥尘)1(0.996004)=(6.00鈥尘)(0.063)=0.379鈥尘

Thus, the length of the passing garage is 0.379鈥尘.

08

(f) Determination of the  xc2

According to the question, the limo is fixed with the xc axis. Then the value of the xc2 will be the value of the length of the car when parked in front of the garage.

Thus, the value of xc2 is 30.5m.

09

(g) Determination of the  tc2

The equation of the value of tc2of event 2 is expressed as:

tc2=tc1LcLgv

Substitute the values in the above equation.

tc2=030.5鈥尘0.379鈥尘0.9980(3108鈥尘/s)=30.121鈥尘(2.9108鈥尘/s)=1.01107鈥塻

Thus, the value of tc2 for event 2 is 1.01107鈥塻.

10

(h) Determination of whether the limo is in the garage or not

According to the point of view of Carman, the limo was not in the garage. The doors of the limo were also not shut.

Thus, the limo was not in the garage with both doors shut.

11

(i) Determination of the event

According to the question, it has been identified that tc2<tc1. Hence, from the point of view of the Carman, the event 1 occurs after the event 2.

Thus, the event 2 occurs first.

12

(j) Determination of the sketch of the events 

The event 1 has been sketched below:

Here, in the above diagram, it can be identified that the car is at a certain distance from the door.

The event 2 has been sketched below:

Here, in the above diagram, it can be identified that the car in front of the door.

Thus, and

13

(k) Determination of the relation of the events

It has been observed that the limo is not in the garage which has both the doors shut. Hence, if the events were related, then the limo would not have been in the garage.

Thus, the events are not casually related.

14

(l) Determination of the person who wins the bet 

It can be observed that both the persons garageman and carman are absolutely correct in their reference frames. Hence, in a certain way, it can be said that both the persons are correct.

Thus, both carman and garageman wins the bet.

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Most popular questions from this chapter


The premise of the Planet of the Apes movies and books is that hibernating astronauts travel far into Earth鈥檚 future, to a time when human civilization has been replaced by an ape civilization. Considering only special relativity, determine how far into Earth鈥檚 future the astronauts would travel if they slept for 120 y while traveling relative to Earth with a speed of 0.9990c, first outward from Earth and then back again?

As in Fig. 37-9, reference frame S'passes reference Sframe with a certain velocity. Events 1 and 2 are to have a certain temporal separation t'according to the S'observer. However, their spatial separation x'according to that observer has not been set yet. Figure 37-24 gives their temporal separation x'according to the observer as a function of for a range of values. The vertical axis scale is set by ta=6渭蝉. What is t'?

In fig. 37-9, the origins of the two frames coincide at t=t'=0 and the relative speed is 0.950c. Two micrometeorites collide at coordinates x=100km and t=200s according to an observer in frame S. What are the (a) spatial and (b) temporal coordinate of the collision according to an observer in frame S' ?

Bullwinkle in reference frame S' passes you in reference frame S along the common direction of the x' and x axes, as in Fig. 37-9. He carries three meter sticks: meter stick 1 is parallel to the x' axis, meter stick 2 is parallel to the y' axis, and meter stick 3 is parallel to the z' axis. On his wristwatch he counts off 15.0 s, which takes 30.0 s according to you. Two events occur during his passage. According to you, event 1 occurs at x1=33.0mand t1=22.0ns, and event 2 occurs at x2=53.0mand t2=62.0ns. According to your measurements, what is the length of (a) meter stick 1, (b) meter stick 2, and (c) meter stick 3? According to Bullwinkle, what are (d) the spatial separation and (e) the temporal separation between events 1 and 2, and (f) which event occurs first?

Spatial separation between two events. For the passing reference frames of Fig. 37-25, events A and B occur with the following spacetime coordinates: according to the unprimed frame,(xA,tA)and role="math" localid="1663045013644" (xB,tB)according to the primed frame,(x'A,t'A) androle="math" localid="1663045027721" (x'B,t'B). In the umprimed frame螖迟=tBtA=1.00鈥壩疾androle="math" localid="1663045143133" 螖虫=xBxA=240鈥尘.(a) Find an expression forin 螖虫'terms of the speed parameterand the given data. Graph螖虫'versusfor two ranges of: (b)0 to0.01and (c)0.1to 1. (d) At what value ofis螖虫'=0?

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