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Describe and explain the vertical motion of a parachutist which jumps out of an aeroplane at time t=0 and then releases the parachute shortly after reaching terminal velocity at time t=T. (Assume air resistance is not negligible).

We need to understand both what this question is asking of us, and what the question tells us. We are asked to investigate the motion of the parachutist, therefore in this case we need to apply Newton’s Laws...
TD
11219 Views

How can a company benefit from economies of scale?

Economies of scale is the concept that as a company increases its output, cost per unit will decrease as fixed costs are spread over a larger number of units. This is known as internal economies of scale and...
FL
30551 Views

Speaking Test: How can I improve my pronounciation?

It is important to remember, having an accent is normal. You can live in the country for decades and still have an accent. It is however equally important that you pay attention to the intonation of a langua...
IL
Answered by Isabel L. • German tutor
2633 Views

Show that the inequality x^4 < 8x^2 + 9 is satisfied for when -3 < x < 3 .

(x^2 - 9)(x^2 + 1) &lt; 0 solving the equation to get solutions to the equality (x^2 - 9)(x^2 + 1) = 0 : x = +/- 3 or x = +/- 1 now consider points either side of these x-intercepts... for x&gt;3: equality i...
HT
Answered by Hakkihan T. • MAT tutor
1550 Views

Express cos(x) + (1/2)sin(x) in terms of a single resultant sinusoidal wave of the form Rsin(x+a)

cos(x) + (1/2)sin(x) : Rsin(x + a) = R{sin(x)cos(a) + cos(x)sin(a)} = (1/2)sin(x) + (1)cos(x) (comparing coeffs.) Therefore Rcos(a) = 1/2 and separately Rsin(a) = 1 So tan(a) = 2 and R^2 = 5/4. Answer: sqrt(...
HT
Answered by Hakkihan T. • Maths tutor
8226 Views