2023-May-Physics_paper_1__TZ2_HL – All Questions with detailed solution
2023-May-Physics_paper_1__TZ2_HL
Topic: Uncertainties and errors
Given: A rocket travels a distance of \(3 \mathrm{~km}\) in \(10 \mathrm{~s}\).
Calculate:\(\frac{\text { the speed of the rocket }}{\text { the speed of light in a vacuum }} ?\)
A. -5
B. -6
C. -7
D. -8
▶️Answer/Explanation
Ans:B
\(\begin{aligned} & v=\frac{3000}{10} =3\times 10^2 \\ & \begin{aligned} \frac{v}{c} & =\frac{3 \times 10^2 \mathrm{~m/s}}{3 \times 10^8m/s} \\ & =1 \times(10^{-6}) \end{aligned}\end{aligned}\)
2023-May-Physics_paper_1__TZ2_HL
Topic: Motion
Given: The variation with time of the displacement of an object is shown.
Calculate: average speed and average velocity of the object over the 10s time interval?
▶️Answer/Explanation
Ans:C
\(\begin{aligned} & \text { Average velocity }=\frac{\text { Total displacement }}{\text { Total time }} \\ \end{aligned}\)
\(\begin{aligned} & =\frac{8}{10} \\ & =0.8 \mathrm{~ms}^{-1}\end{aligned}\)
\(\begin{aligned} & \text { Average speed}=\frac{\text { Total distance }}{\text { Total time }} \\ \end{aligned}\)
\(\begin{aligned} & =\frac{10+2}{10}=\frac{12}{10} \\ & =1.2 \mathrm{~ms}^{-1}\end{aligned}\)
2023-May-Physics_paper_1__TZ2_HL
Topic: Forces
Given : A mass is suspended by a light string from the roof of a car. The car is accelerating up an incline.
Calculate: free-body diagram for the mass?
▶️Answer/Explanation
Ans:B
So only B and C option Possible ,
IN , B $F_{net}$ is in correct direction
In C, direction of F net is not in correct direction
2023-May-Physics_paper_1__TZ2_HL
Topic: Motion
Given: An object is travelling with velocity \(5 \mathrm{~ms}^{-1}\). The object then accelerates to \(15 \mathrm{~ms}^{-1}\) in the same direction.
Calculate:variation with time of the acceleration of the object?
▶️Answer/Explanation
Ans:D
\(\begin{aligned} &a=\frac{d {v}}{d t} \\ & \int a d t=\Delta v \\ & \begin{aligned} \text { Area under graph } & =\text { Change of velocity } \\ & =15-5 \\ & =10 \mathrm{~ms}^{-1}\end{aligned}\end{aligned}\)
Area in graph D,
base $\times $ altitude $= 5\times 2 =10~ m/s$
2023-May-Physics_paper_1__TZ2_HL
Topic: Forces
Given: The angle \(\theta\) between a ramp and a horizontal surface slowly increases from zero. An object on the ramp does not slide as \(\theta\) increases.
Calculate:frictional force on the object is
A. constant.
B. negligible.
C. proportional to \(\cos \theta\).
D. proportional to \(\sin \theta\).
▶️Answer/Explanation
Ans:D
As, block does not slide so Friction will be equal to pulling force
$f=mg sin\theta $
$f\propto \sin \theta$