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# test2 - Test 2 phy 240 1 a b c d physics dealt mostly with...

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Test 2 phy 240 1. a) How is the velocity of a particle defined? b) What is an inertial reference frame? c) Describe friction. d) Compare the acceleration of a particle in reference frames related by the Galilean transformation. 2. Identifying the force (indicate the object, the source and the type of each force), draw the free body diagram for a) a van parked on a hill b) a bucket hanging under a helicopter moving with constant velocity. (Make sure that the net force is consistent with the indicated motion.) 3. Consider a satellite of mass m moving around a planet of mass M and radius R, at an altitude h above the planet’s surface, as illustrated in the figure. Relate the speed of the satellite to the given information (m, M, R, and h). (Hint. Assume you know the gravitational constant G.) 4. An object (“particle”) has a velocity of [3,0] m/s at one instant. Five seconds later, its velocity has changed to [8,10] m/s. Assuming that the object was subject to a constant net force, a) find the average acceleration of the object (during this time interval) b) and the displacement of the object (in the same time).

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