Mechanics Random Retrieval

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Mechanics Random Retrieval

This quiz contains all the questions in the Mechanics section. The website will pick 10 questions at random.

1 / 10

A 0.3 m long screwdriver is placed under the circular lid of a paint can and a force of 15 N is applied downward at the end of the screwdriver and the lid opens, pivoting at the opposite side to the screwdriver. The lid has a circumference of 48 cm. Calculate the moment about the open side of the lid.

2 / 10

The Shenzhou (Chinese: 神舟) re-entry capsule has a of mass 7840 kg falling through the atmosphere at a steady velocity of 1.75x104 Mph. Calculate its kinetic energy. g = 9.81 ms-2, 1 Mile = 1.6 km

3 / 10

A bullet of mass 4.02 g is fired at a speed of 940 ms-1 from an SA-80 rifle. The bullet strikes a block of hardwood of mass 0.512 kg hanging at rest from a long string. The bullet enters the wood and becomes lodged in the block. Calculate the initial speed the wooden block from rest immediately after impact.

4 / 10

Momentum is a scalar quantity.

5 / 10

Select the best statement for Newton's 2nd Law

6 / 10

The SI unit for a Newton is _______ .

7 / 10

A game of tug of war occurs between the English and Mathematics departments. The English department pull westerly with a force of 120.50 N and the Mathematics department pull easterly with a force of 108.25 N.

Calculate who wins and with what resultant force.

8 / 10

A paratrooper jumps from an aircraft. Assuming no air resistance, she accelerates due to gravity for 12 seconds before deploying her parachute. Calculate how far she falls from the aircraft until she deploys her parachute.

9 / 10

Select if the following is a scalar or a vector: energy

10 / 10

Select if the following is a scalar or a vector: mass

 

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