A train consists of a 50-Mg engine and three cars, each having a mass of 30 Mg. If it takes 80 s for the train to increase its speed uniformly to 40 km/h, starting from rest, determine the force T developed at the coupling between the engine E and the first car A. The wheels of the engine provide a resultant frictional tractive force F which gives the train forward motion, whereas the car wheels roll freely. Also, determine Facting on the engine wheels

5. Request edit access A person is holding a stick by one end. A mass of 1000 g is hung from the stick. Each stick is identical, but the distance that the mass is hung and the angle at which the mass is hung is different in each case. Ignore the mass of the stick. I A B 1/2 30% C D E 60° 450 Rank the difficulty of holding the meter stick from the left end in the position shown. OR 2 3 Greatest Explain your reasoning. 5 All Least the same All zero Cannot determine Extra Credit

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Q3: determine shear stress (t) for each 16-mm diameter bolt. 40 kN 40 kN 30 mm 80 kN 30 mm