Materials Random Retrieval

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Materials Random Retrieval

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

1 / 10

A ball bearing of diameter 5.6 mm is dropped into a liquid which has a viscosity of 5.4 Pa s and a density of 1.38 kgL-1. In the liquid, it reaches a terminal velocity of 0.023 ms-1. Calculate the mass of the ball bearing. g=9.81 Nkg-1

2 / 10

HMS Astute is a nuclear-powered submarine in service with the Royal Navy, she can dive to depth of 300 m in seawater of density 1024 kgm-3. If the pressure inside the submarine is kept at sea level (1.01x105 Pa), calculate the resultant force on a section of the hull of area 20 m2 at her maximum depth.

3 / 10

A 4.2 g balloon is inflated with 1.8 g of air until it is 1.4x10-3 m3 in volume. Calculate the density of the inflated balloon.

4 / 10

The Young's Modulus for a single walled carbon fibre nanotubes of diameter 4 nm is 1000 GPa. If it is placed under 75% strain, what force is required to break it?

5 / 10

The graph above shows a wire being extended by adding masses. Estimate from the graph the Young's modulus.

6 / 10

A material has a stress of 6x108 Nm-2 and is placed under a 5% strain. Calculate the value for the materials Young's modulus.

7 / 10

Which material on the graph above is the weakest?

8 / 10

A stress-strain graph is shown above for an unknown material. Where on the curve would you mark the UTS point?

9 / 10

A wire has a diameter of 0.5 mm and a breaking stress of the wire is 7.4x1010 Nm-2. Calculate the mass that would break the wire. g = 9.81 ms-2

10 / 10

Under a 4 N force, two identical springs, in parallel, stretch 130 mm. Calculate the spring constant for one of the springs.

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