March 2023 Week 5 Quiz

The coefficient of static friction between diamond and metal is 0.15.

At what angle will a piece of diamond begin to slide on a metal surface?

A spherical mass is attached to a spring and undergoes SHM, as shown in the displacement vs time diagram.

When is the potential energy of the system the largest?

• The potential energy is constant

The diagram shows an aircraft with a weight of 180 kN.

What thrust force must be delivered from the lift fans in order to keep the aircraft horizontal?

• 68 kN

• 136 kN

• 34 kN

• 100 kN

The final section of this roller coaster ends in a vertical loop.

At which one of the positions marked A, B and C would the passengers experience the maximum reaction force exerted by their seat?

• A

• B

• C

• All positions have the same reaction force

A girl takes 42.0 seconds to complete 15.0 complete swings.

What is the length of the chains from the top of the swing to the girl's center of mass?

• 2.05 m

• 4.37 m

• 6.65 m

• 1.95 m