LHTB Physics Pre-Exam (2.3b. Mechanics – Dynamics)

A good refrigerant has a...

• high condensation temperature and low condensation pressure

• low condensation temperature and low condensation pressure

• low condensation temperature and high condensation pressure

What is the momentum of a ball of mass 2 grams and has a velocity of 10cm/s?

• 0.0002 kg.m/s

• 5kg.m/s

• 20kg.m/s

A gyroscope suffers from apparent wander. This is due to...

• the aircraft flying along a north/south track

• the earth’s rotation

• friction on the gimbals and bearings

The SI unit of momentum is the…

• kilogram metre per second

• kilogram / metre (kg/m)

• metre squared (m2)

Precession in a gyro is…

• proportional to the square of the magnitude of the torque applied

• inversely proportional to the magnitude of the torques applied

• proportional to the magnitude of the torque applied

A gyro with a fixed point free to rotate in three axis is...

• an earth gyro

• a space gyro

• a tied gyro

What type of friction requires the greatest force to overcome it?

• Dynamic friction

• Static friction

• Rolling friction

If a gyro is constrained to an external reference and has three degrees of freedom it is…

• a tied gyro

• an earth gyro

• a space gyro

The point at which an applied force overcomes friction and an object begins to move is the co-efficient of...

• kinetic friction

• limiting friction

• static friction

The amount a gyro precesses when a torque is applied is...

• inversely proportional to the torque

• proportional to the square of the torque

• proportional to the torque