The mass of a propeller is 4.5 tons and its centre of gravity is 3.5 mm from the centre of rotation. Find the pull due to centrifugal force when it is rotating at 120 rev/min.

Q3/ A shaft has three eccentric of mass 1 kg cach. The central plane of the eccentrics is 50 mm apart. The distances of the centers from the axis of rotation are 20, 30 and 20 mm and their angular positions are 120° apart. If the shaft is balanced by adding two masses at a radius of 70 mm and at a distance 100 mm from the central plane of the middle eccentric, find the amount of the masses and their angular positions.

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1. For each mass, calculate the centrifugal force(total magnitude) as well as its horizontal and vertical components. 2.Determine the magnitude and the angular orientation of the total centrifugal force associated with the imbalance masses. 3. Determine the magnitude and the angular orientation of the balancing mass if it is located at a radius of 120mm

A weight with mass mw=150 g is tied to a piece of thread wrapped around a spool, which is suspended in such a way that it can rotate freely. When the weight is released, it accelerates toward the floor as the thread unwinds. Assume that the spool can be treated as a uniform solid cylinder of radius R=4.00 cm and mass Ms=200 g. Find the magnitude ?a of the acceleration of the weight as it descends. Assume the thread has negligible mass and does not slip or stretch as it unwinds. Use ?=9.81 m/s2.   Find the tension T in the thread.

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A single cylinder reciprocating engine has speeded 300 RPM. Stroke 250 mm, mass of reciprocating parts 50 kg. Mass of revolving parts at 150 mm radius 37 kg. If two fourth of the reciprocating parts and all the revolving parts are to be balanced, find (i) The balance mass required at 400 mm radius (ii) The residual unbalanced force when the crank has rotated 45° TDC.

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The cable spool shown at the right has a weight of 50 lbs and has a moment of inertia of .28 slug-ft^2. Assume the spool rolls without slipping when we apply a 50-lb tension in the cable. Find: friction force between the spool and the ground.

Now consider two very similar semi trucks. One travels at 40 km/hr and another travels at 75km/hr. Which truck will have the greater motion inertia?