A square is 1.0 m on a side. Point charges of +4.0 ?C are placed in two diagonally opposite corners
In the other two corners are placed charges of +3.0 ?C and -3.0 ?C. What is the potential (relative to infinity) at the midpoint of the square? (k = 1/4??0 = 9.0 × 109 N ? m2/C2 )
A) 1.0 × 106 V B) infinite C) 1.0 × 105 V D) 0 V E) 1.0 × 104 V
C
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_____ is the rich solution of organic molecules in Earth's first oceans
A) Organelle soup B) Nuclear soup C) Plasma soup D) Primordial soup
A string with a mass per length of 2.00 gm/m is stretched with a force of 150 N between two points that are 0.500 m apart. The fundamental frequency of the stretched string is in tune with the fundamental frequency of an organ pipe filled with air and open at both ends. The velocity of sound in air at 0
is 331 m/s. If the temperature of the air increases by 20
then what is the length of the organ pipe?
A. 70.5 cm B. 62.6 cm C. 59.3 cm D. 53.8 cm E. 50.2 cm
Multiple-Object Accelerating Systems: Two objects of unequal masses, M and m (M > m), are connected by a very light cord passing over an ideal pulley of negligible mass. When released, the system accelerates, and friction is negligible. 
Which one of the following free-body diagrams most realistically represents the forces acting on the two objects in the moving system?
A. 
B. 
C. 
D. 
A coal-fired plant generates 600 MW of electric power. The plant uses 4.8 × 106 kg of coal each day. The heat of combustion of coal is 3.3 × 107 J/kg
The steam that drives the turbines is at a temperature of 300°C, and the exhaust water is at 37°C. (a) What is the overall efficiency of the plant for generating electric power? (b) What is the Carnot efficiency?