# Answer on Mechanics | Relativity Question for Christbeauty

Question #58094

1 A stationary observer at a railway station sees a passenger in a railway coach that is in motion at constant speed in a straight and horizontal track. Which of the following best describes the frames of reference from which both the observer and the passenger describe each other's motion?

inertial

uniform

constant

relativistic

2 Consider the two observers O and

O′

at the origins of the frames of reference

S

and

S′

respectively, which are in relative motion at constant velocity

v

along the x-axis as illustrated in figure TMA 1_Fig1. Suppose the origins

O

and

O′

as well as the axes of the coordinates of these frames are coincident at an initial time

t=t′=0

. The two observers are equipped with measuring instruments to determine the coordinates of the event at P. Measurements made in the

S

frame are related to those made in the

S′

by the following EXCEPT

x′=x−vt

y′=y

t′=t

z′=z+vt

3 The joule (J) is the same as

kgm−1s−2

kgm−2s−1

kgm2s−2

kgms−1

inertial

uniform

constant

relativistic

2 Consider the two observers O and

O′

at the origins of the frames of reference

S

and

S′

respectively, which are in relative motion at constant velocity

v

along the x-axis as illustrated in figure TMA 1_Fig1. Suppose the origins

O

and

O′

as well as the axes of the coordinates of these frames are coincident at an initial time

t=t′=0

. The two observers are equipped with measuring instruments to determine the coordinates of the event at P. Measurements made in the

S

frame are related to those made in the

S′

by the following EXCEPT

x′=x−vt

y′=y

t′=t

z′=z+vt

3 The joule (J) is the same as

kgm−1s−2

kgm−2s−1

kgm2s−2

kgms−1

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