Physics+_ Dynamics - Name: _ Class: _ PHYSICS+ Date:...

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Name: __________________________ Class: ________ Date: 01/08/2011 PHYSICS + DYNAMICS 1. A crate of mass 20 kg is pulled upwards with constant acceleration by a cable attached to a motor. The cable can withstand a maximum tension of 500 N. Determine the maximum acceleration a max possible for the crate. 2. An engine of mass 40 000 kg is pulling a truck of mass 8000 kg at constant speed up a slope inclined to the horizontal at an angle θ where sin = 0.025. Frictional resistances are 18 000 N for the engine and 2400 N for the truck. Calculate (a) The tension in the coupling between the engine and the truck, and (b) The tractive force (i.e. driving force) exerted by the engine. The engine and truck move on to a straight horizontal track with the frictional resistances unchanged. If the tractive force is now 60 000 N, calculate (c) The acceleration produced, and (d) The new tension in the coupling. 3.
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Physics+_ Dynamics - Name: _ Class: _ PHYSICS+ Date:...

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