2022-May-Physics_paper_2__TZ1_HL – All Questions with detailed solution
Q.1(a).2022-May-Physics_paper_2__TZ1_HL
Topic: Forces
Given: A student uses a load to pull a box up a ramp inclined at 30°. The string passes over a pulley that runs on a frictionless axle. Friction acts between the base of the box and the ramp. Air resistance is negligible.
The load has a mass of 3.5kg and is initially 0.95m above the floor, mass of the box is 1.5kg, load is released and accelerates downwards.
Calculate: Outline two differences between the momentum of the box and the momentum of the load at the same instant.
Answer/Explanation
Solution:
The momentum of the box and the momentum of the load are different for two reasons:
Direction: At the same instant, the momentum of the box will be in the upward direction, while the momentum of the load will be in the downward direction. This is because the box is moving up the ramp due to the force of friction acting in the opposite direction to the motion of the load.
Q.2(a).2022-May-Physics_paper_2__TZ1_HL
Topic: Thermal concepts
Given: mass of $55 \mathrm{~g}$ of milk enters the sterilizing unit every second and flows over an electrical heating element.
The temperature of the milk is raised from $11^{\circ} \mathrm{C}$ to $84^{\circ} \mathrm{C}$.
Specific heat capacity of milk $=3.9 \mathrm{~kJ} \mathrm{~kg}^{-1} \mathrm{~K}^{-1}$
Calculate: the power input to the heating element(in appropriate unit)
Answer/Explanation
Solution:
$\text{mass}=55\times 10^{-3}$
$\Delta T=(84-11)=73~K$
$c=3.9 \mathrm{~kJ} \mathrm{~kg}^{-1} \mathrm{~K}^{-1}$
$\text{Power}=\frac{\text{Energy}}{\text{time}}$
$P=\frac{\mathrm{m\cdot c\cdot \Delta T}}{\text{1 sec}}$
substitute all the values in formula ,