An engineer is studying the mileage performance characteristics of five types of gasoline additives. in the road test he wishes to use cars as blocks; however, because of a time constraint, he must use an incomplete block design. he runs the balanced design with the five blocks that follow. analyze the data from this experiment (use α-0.05) and draw conclusions.

car

additive 1 2 3 4 5

1 17 14 13 12

2 14 14 13 10

3 12 13 12 9

4 13 11 11 12

5 11 12 10 8

What difference(s) did you notice using a pneumatic circuit over hydraulic circuit.explain why the pneumatic piston stumbles when it hits an obstacle.

Aloaded platform of total mass 500 kg is supported by a dashpot and by a set of springs of effective stiffness 72 kn/m. it is observed that when the platform is depressed through a distance x = 12.5 cm below its equilibrium position and then released without any initial velocity; it reaches its equilibrium position in the shortest possible time without overshoot. find the position and velocity of the loaded platform 0.10 sec. after its release. if a further load of 400 kg is added to the platform, find, i) the frequency of damped vibrations, and i) the amplitude of vibration after 2 complete oscillations, given that the initial amplitude is 15 cm.

If a particle moves along a path such that r : (3 sin t) m and ? : 2t rad, where t is in seconds. what is the particle's acceleration in m/s in 4 seconds? a)- 16.43 b)- 16.29 c)- 15.21 d)- 13.79