D O C . 1 3 D I A L O G U E A B O U T R E L A T I V I T Y T H E O R Y 6 9
1. Clock gets accelerated by
an external force along the positive -
axis until it attains the velocity v.
remains at rest.
1. There arises a gravitational field in
the direction of the negative x-axis, in
which the clock falls accelerated
until it attains the velocity v. An exter-
nal force along the positive x-axis acts
upon the clock and prevents it
from moving. The gravitational field
vanishes again as soon as clock
has attained the velocity v.
2. moves with constant veloc-
ity v until it reaches point on the
positive -axis. remains at rest.
2. moves with constant veloc-
ity v until it reaches point on the
negative -axis. remains at rest.
3. Clock gets accelerated by
an external force acting along the neg-
ative -axis until it attains the veloc-
ity v in the negative -direction.
remains at rest.
3. There arises a homogeneous
gravitational field in the direction of
the positive x-axis, in which the clock
gets accelerated in the direction of
the positive x-axis until it has attained
the velocity v, whereupon the gravita-
tional field again vanishes. An exter-
nal force along the negative x-axis
prevents the clock from making
any movement in this gravitational
field.
4. moves back with constant
velocity v in the direction of the nega-
tive -axis close to remains at
rest.
4. moves with constant veloc-
ity v in the direction of the positive -
axis close to . remains at rest.
5. An external force brings to
rest.
5. There arises a gravitational
field in the direction of the negative
-axis which brings clock to rest,
whereupon the gravitational field van-
ishes again. During this time is
kept at rest by an external force.
U
2
x
U
1
U1
U2
U1
U2
B
x
U1
U1
B′
x
U2
U2
x
x
U1 U1
U2
U2
[p. 699]
x
U1. U1
U1
x
[7] {1}
U2 U2
U2
x
U1
U2
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