The light intensity, I units passing through y meters of water is given by the equation: I=I1e-2y y≥0 Where I1 units is the light intensity at the surface and k is a constant called the absorption coefficient.
Above the cross section of Warrangamba Dam and in the table below are the readings of two light intensity measurment from the dam.
Using the table show that k=16loge(43) and hence find I1 correct upto 2 decimal places. Sketch the graph I=I1e-2y indicating the vertical intercept. The fish that live in this dam require light in order to survive. One Kind of fish requires light of an intensity that is no less than 35% of the intensity at the surface. Determine teh maximum depths, correct to the nearest ,metre , at which this kind of fish survive.
Write down the formula for: the nth term of an arithmetic series with first term a and the common differenced the sum of the first n terms of this series
A particular spider's web consists of a series of regular hexagons with a common centre 0, held together by rays through 0, as in the figure, where only some of the hexagons are show
The vertices of the smallest hexagons are 4cm from 0. The ve1iices of the next hexagons are 2cm further away and they continue at 2cm intervals along the rays until the vertices of the last hexagon ABCDEF are 60cm from 0. How many hexagons are there? What is the length, in em, ofthe perimeter ofthe smallest hexagon? What is the total length of thread used by the spider in making this web (including the six rays from 0)?
DIAGRAM NOT DRAWN TO SCALE
Given AB∥CD, ∠BCE=40° and BC=EC, find the size of ∠ECD, giving reasons.
Draw a neat sketch showing points A(3, -1), B(7,2) and C(1,10) on a number plane. i) Find the gradients of BC and of AB. ii) State why ABC is a right angled triangle. iii) Find the area of ∆ ABC.
Consider the following diagram and question:
Given that the area shaded A is 6 uniti, area B is 2 unit and area C is 3 unit, find ∫03f(x)dx Maryanne's solution was ∫03f(x)dx=6+2+3=11 units2 Maryanne's solution has one error in EACH of her lines of working. Clearly explain (in words) what were her errors Write the correct solution
.The diagram shows the graph of the function y=2x-x2 i) Find the x coordinate of the point B where the curve crosses the positive x-axis. ii) Find the area of the shaded region contained by the curve y=2x-x2 and the x -axis. iii) Write down a pair of inequalities that specify the shaded region
Find ∫xex2.dx
Consider the curve y=x3-6x2+12x+2 i) Show the curve has only one stationary point, find its coordinates and determine its nature. ii) State the values of x for which the curve is concave up. iii) State the values of x for which the curve is increasing.
The bowl of a wine glass is formed by rotating the arc of the curve y=2x2+2 between (0,2) and (2,6) about the y-axis. Find the volume of the bowl of the glass so formed.
Cookies help us to deliver the best experience on our website. By using our website, you agree to the use of cookies. Find out how we use cookies.