Q150 · Practice questionSimple familiar1 mark
QUESTION 150
Which observer defines an inertial frame over the described interval?
(A)
An observer on a spacecraft coasting at constant velocity in deep space
(B)
An observer in a car travelling at constant speed around a bend
(C)
An observer in a lift while its speed increases
(D)
An observer attached to the rim of a rotating disc
WORKED SOLUTION
1 markAnswer A
ANSWER
A. An observer on a spacecraft coasting at constant velocity in deep space
Worked solution
An inertial frame has no acceleration. Constant speed around a bend or on a disc involves changing velocity direction; the accelerating lift is also non-inertial.
Equivalent physically justified methods and consistent equivalent units accepted.
Displayed decimals are model answers; accept appropriate significant figures and consistent rounding from stated constants.
Select A.
Practice question aligned to the current QCAA syllabus; review the worked solution and marking criteria.
View the QCAA syllabus