Please show working thankyou The loadextension curve for a n

Please show working, thankyou

The load-extension curve for a novel composite material shows the following: the yield point was measured to be 400 N, at an extension of 2 mm over a gauge length of 10 cm, on a 3 cm diameter tensile specimen as shown. Assuming that the fiber is 3 times as stiff as the matrix material and that there was no delamination between the continuous fiber reinforcement and the surrounding matrix, calculate the elastic modulus of the 30/70 fiber/matrix composite material. Answer to two decimal places with the correct magnitude prefix and units.

Solution

The loaded four wheel trailer shown in Figure P8.10 has a total mass of 5t and is pulled along a level road. Average resistance to motion (friction and windage) is 2 per cent of the total weight and acts at the same horizontal level as the applied force P. Determine the normal reaction at each of the front and rear wheels when the trailer moves:

a) at constant velocity

b) with forward acceleration 1.5m/s².

(Average resistance to motion is 2% of total weight is not required.)