Physics 20 Practice Final Exam Questions

Using the provided incline plane & pulley system; What is a possible maximum value of the hanging mass (m2) if the system is at equilibrium and we treat this as a isolated system by ignoring any kinetic friction.

• 8.19kg

• 5.74kg

• 3.50kg

• 2.50kg

The hanging mass (m2) is then changed for a different mass of 15.0kg. Now account for the kinetic fiction of the incline, and calculate the value of system's acceleration.

• 2.09m/s2

• 2.35m/s2

• 3.92m/s2

• 5.87m/s2

Acceleration is defined as the:

• rate of change of position

• rate of change of speed

• rate of change of velocity

• rate of change of distance

A domestic plane is travelling from City A to City B due North 500km. There is a wind that blows at 45.0km/h at 27.0^o East of North. The plane can travel at 150km/h in is still air.

What is the direction the pilot should adjust his heading to end up in City B.

• 7.82 degrees North of West

• 7.82 degrees West of North

• 82.18 degrees West of North

• Due North

Which vector diagram correctly shows the change in velocity Δv of the mass?

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In the diagram provided, a marble (small glass sphere) rolls down a frictionless track, the bottom part of which has been bent into a loop. The end A of the track, from which the marble is released, is at a height of 0.80 m above the ground. Point B is the lowest point and point C the highest point of the loop. The diameter of the loop is 0.35 m. The mass of the marble is 0.050 kg. Friction forces and any gain in kinetic energy due to the rotation of the marble can be ignored. Consider the marble when it is at point B and C.

Which position has the greatest speed and then where is the greatest normal force experienced by the marble?

When different weights are hung on a spring, the spring stretches to different lengths. The results are shown in the following ;

Fg (N) 2.0 4.0 6.0 8.0 10 12 14 16 18

L (mm) 15 32 49 64 79 98 112 126 149

If the spring is extended to 105mm, determine the force the spring exerts on the suspended weight. __._N (please record your 3 digit answer including decimal point)

Based on the information gathered from the table, determine the spring constant, k, in N/m. ____N/m (please record your answer in a.bc x 10^d format)

Draw out the Free Body Diagram(s) as well as energy diagrams for if the spring were allowed to "freely-oscillate"

Answer explanation

Remember that there should be at least three different positions where the spring is moving towards equilibrium, at equilibrium, past equilibrium to maximum stretch.

For wave A, the particles move:

• perpendicular to the direction of the wave, and is transverse.

• parallel to the direction of the wave, and is transverse.

• perpendicular to the direction of the wave, and is longitudinal.

• parallel to the direction of the wave, and is longitudinal.