At LNG refinery site as part of a lubricating system for heavy machinery, oil of density 850kg/m^3 is pumped through a cylindrical pipe of diameter 7.0cm at a rate of 10.5 litres per second. What is; (Given: 1000 litres = 1m^3)

a) the spread of the oil?
(Use this formula: flow rate/ cross-section area = velocity)

b) the mass flow rate?
(Use this formula: mass flow rate= density x cross-sectional area x velocity)

6 cos 34, 6 sin 34 trig

the motion of a pendulum is a classic example of mechanical energy conservation. a pendulum consists of a mass (known as a bob ) attached by a string to a pivot point. as the pendulum moves it sweeps out a circular arc, moving back and forth in a periodic fashion.

luster is not a good characteristic to use by itself because luster is the property of minerals that indicates how much the surface of a mineral reflects light. the luster of a mineral is affected by the brilliance of the light used to observe the mineral surface.