Which statement comparing examples of renewable and nonrenewable resources is true?

a. wind is a renewable resource because it can't be used up, but coal is a nonrenewable resource because it will eventually run out.

b. wind is a nonrenewable resource because it can't be used up, but coal is a renewable resource because it will eventually run out.

c. both wind and coal are renewable resources because they will never run out.

d. both wind and coal are nonrenewable resources because they will eventually run out.

Three different objects, all with different masses, are initially at rest at the bottom of a set of steps. each step is of uniform height . the mass of each object is a multiple of the base mass : object 1 has mass 4..00m , object 2 has mass 1..96m , and object 3 has mass . when the objects are at the bottom of the steps, define the total gravitational potential energy of the three-object system to be zero. if the objects are then relocated as shown, what is the new total potential energy of the system? each answer requires the numerical coefficient to an algebraic expression. each algebraic expression is given using some combination of the variables , , and , where is the acceleration due to gravity. enter only the numerical coefficient. (example: if the answer is 1..23mgd , just enter 1.23)

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9.98 kg of r-134a at 300 kpa fills a rigid container whose volume is 14 l. determine the temperature and total enthalpy in the container. the container is now heated until the pressure is 600 kpa. determine the temperature and total enthalpy when the heating is completed. use data from the steam tables.