Blog

Water is pumped upwards through a pipe at the rate of 920 litres per minute.  The inside diameter of the pipe varies from 70 mm at its lower end to 120 mm at its upper end.  The pressure is 2.4 bar at the lower end of the pipe and 1.4 bar at the upper end.  The upper end is 9 m above the lower end of the pipe.  Find the entry velocity (in m/s).

A 175 g copper block at 900 ºC is dropped into an aluminium container calorimeter cup initially at 200ºC. The calorimeter cup has a mass of 400 g and contains 430 g of water, also at 200ºC. What is the final temperature of the system (in ºC)? (cAl = 0.215 cal/(g ºC), cwater = 1 cal/(g ºC), and ccu = 0.0920 cal/(g ºC).

A mass of 300 g of coffee at 95°C is poured into a 200 g glass mug at 20 °C. Neglecting any heat transferred to the surrounding air or table, determine the final temperature of the mug and coffee (in °C). (Ccoffee = 1.00 cal/g °C, Cmug = 0.200 cal/g °C)

The figure below shows a simplified Life Cycle Analysis for a product.   Give an example of a product this could represent and explain your reasoning? (4 marks)

Describe the microstructure of pearlite and how this is formed? (3 marks)

A steel component is heated to 800C and then quenched rapidly in water What effect does this have on the material properties of the component? (2 marks)

A Charpy impact test is performed, the pendulum starting height (ha) is 0.4m and the final height (hb) is 0.23m   Using the values for (ha) and (hb) above, calculate the impact energy absorbed by the sample? (5 mark)

The American Psychological Association accepted forensic psychology as a specialization in the year

An object is thrown upward. At the top of its path,

The difference between transverse and longitudinal waves is the