Top answers

The braking distance of a road train travelling at 15m/s is 70m. Assuming that the same braking force is applied at all speeds, show that the braking distance of a road train when travelling at 25m/s is about 190m.

Energy = force x distance and Energy = 0.5 x mass x velocity squared Hence, force = (0.5 x mass x velocity squared) / distance --- (equation 1) This applies for both situation A and B, and given that force i...
JJ
Answered by Jack J. • Physics tutor
10814 Views

How do I differentiate a trigonometric function for something that is not just a single variable (e.g. d/dx (sin(3x))?

In order to differentiate a trig function with a term in front of the variable you are differentiating, you must use the chain rule. For example d/dx (sin (3x)) becomes 3cos(3x) because you have to multiply ...
KT
Answered by Kieran T. • Maths tutor
5280 Views

Discuss pricing and non-pricing strategies

There are a number of pricing and non pricing a firm may use in order to seize market share, increase its total revenue and hence profits. Some pricing methods involve, a reduction in prices, predatory prici...
AP
25415 Views

What is De Moivre's theorem?

De Moivres theorem states that e^j(theta) = cos (theta) +jsin (theta) and this can be used to convert powered trig functions to the form of regular sines and cosines (i.e. sin^3(x) into a sum of terms includ...
KT
Answered by Kieran T. • Maths tutor
5685 Views

What is a moment?

A moment about a point is the product of a force applied and the distance perpendicular to the line of action of that force. So M = F*d
KT
Answered by Kieran T. • Physics tutor
3026 Views