FSG#102_DONE 27.12.2020

1)Τhe connecting rod AB of a certain internal combustion engine weighs 1.2 lb with mass center at G and has a radius of gyration about G of 1.12in.The piston and piston pin A together weigh 1.80lb.The engine is running at a constant speed of 3000 rev/min so the angular velocity of the crank is 3000(2π)/60=100π rad/sec.Neglect the weights of the components and the force exerted by the gas in the cylinder compared with the dynamic forces generated and calculate the magnitude of the force on the piston pin A for the crank angle θ=90 degrees.Answer kg and 3 decimals

4)The team wants to test the car is slalom course. If the maximum lateral acceleration can be 0.7g and the maximum velocity during the slalom is 80km/h what cone spacing L should be used? g=9.81

A)147.6 ft

B)46.1 m

C)280 m

D)9 m

5)Τhe elements of the "swing-axle" type of independent rear suspension for automobiles are depiected in the figure.The differential D is rigidly attached to the car frame.The hald-axle are pivoted at their inboard ends(point O for the half-axle shown) and are rigidly attached to the wheels.Suspension elements not shown constrain the wheel motions to the plane of the figure.The weight of the wheel-tire assembly is W=100lb and its mass moment of inertia about a diametral axis passing through its mass center G is 1lb*ft*sec^2.The weight of the half-axle is negligible.The spring rate and shock-absorber damping coefficient are k=50lb/in and c=200lb*sec/ft respectively.If a static tire imbalance is present as represented by the additional concentrated weight w=0.5 lb as shown determine the damping ratio ζ.Assume small angular deflections and neglect gyroscopic effects and any car frame vibration.In order to avoid the complications associated with the varying normal force exerted by the road on the tire treat the vehicle as being on a lift with the wheels hanging free.(3 DECIMALS)

7)Which of the follow answers agree with the competition's rules about vehicle's number?

A)Height of the vehicle=5.91inches,Stroke width and spacing between numbers=0.7874inches, Either white numbers on a black background or black numbers on a white background.

B)Height of the vehicle=140mm,Stroke width and spacing between numbers=19mm, Either blue numbers on a black background or red numbers on a white background.

C)Height of the vehicle=0.443fts,Stroke width and spacing between numbers=0.06fts, Either white numbers on a black background or black numbers on a white background.

D)Height of the vehicle=160mm,Stroke width and spacing between numbers=20mm, Either black numbers on a black background or whte numbers on a white background.

9)A 30-g tire-balance weight is attached to a vertical surface of the wheel rim by means of an adhesive backing.The tire-wheel unit is then given a final test on the tire-balance machine.If the adhesive can support a maximum shear force of 80 N determine the maximum rotational speed N for which the weight reamins fixed to the wheel.Assume very gradual speed changes.Anser (1234) RPM

FSG#102_DONE 27.12.2020

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