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Question 6 (10 points)  A 16-pound object stretches a spring 8/9 feet by itself. There is no damping and no external forces acting on the system.  The spring is initially displaced by 6 inches upward from its equilibrium position and given a velocity of 1 ft/sec downward.  Find the displacement at any time t. 

Question 6 (10 points) Find the general solution (and a particular solution for the IVP) and determine whether there is any transient term in the general solution. where

Question 10 (10 points) A 24-volt battery is connected to a series circuit in which the inductance is henry and the resistance is 12 ohms. Determine the current if the initial current is zero.

Question 2 (10 points) Find an implicit general solution for the first-order ordinary differential equation.  

Question 3 (10 points) Show that the given first-order differential equation is not exact and then solve it by finding the appropriate integrating factor.

The Pacific coast of the United States is generally experiencing greater erosion than the Atlantic and Gulf coasts.

All of the following are typically characteristic of depositional shores except:

Ocean sediments provide all of the following mineral resources except:

The doldrums can be found at the Equator.

Compare and contrast biogenous and lithogenous sediments.