Use the graph to answer the question that follows.

 

The graph represents a firm in monopolistic competition. Which of the following statements about the firm's price is accurate?

	The price is set at the intersection of MR and MC.
	The price is set at the intersection of MC and D.
	The price is set at the intersection of ATC and MC.
	The price is set at the intersection of ATC and D.
	The price is set on the ATC above the intersection of MC and D.

A rail gun uses electromagnetic forces to accelerate a projectile to very high velocities. The basic mechanism of acceleration is relatively simple and can be illustrated in the following example. A metal rod of mass 50.0 g and electrical resistance 0.400 rests on parallel horizontal rails that have negligible electric resistance. The rails are a distance L = 9.00 cm apart. (Figure 1)The rails are also connected to a voltage source providing a voltage of V = 5.00 V. The rod is placed in a vertical magnetic field. The rod begins to slide when the field reaches the value B = 0.218 T. Assume that the rod has a slightly flattened bottom so that it slides instead of rolling. Use 9.80 m/s for the magnitude of the acceleration due to gravity. Part A 0 Finds, the coefficient of static friction between the rod and the rails. Give your answer numerically. View Available Hint(s) 195| Hs = 0.00200 Submit Previous Answers X Incorrect; Try Again; 5 attempts remaining ?