An irreversible engine operating between the temperatures of 550 K and 300 K extracts 1200 J of heat from the hot reservoir and produces 450 J of work. How much entropy is created in the process?
A) 0.32 J/K
B) 0.68 J/K
C) 0.44 J/K
D) 0.73 J/K
E) 0 J/K
A
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Indicate whether the statement is true or false
Three long, straight, parallel wires all lie in the yz plane and each carries a current of 20 A in the positive z direction. The two outer wires are each 4.0 cm from the center wire. What is the magnitude of the magnetic force on a 50-cm length of either of the outer wires?
a. 1.0 mN b. 0.50 mN c. 1.1 mN d. 1.5 mN e. 2.0 mN
Over the course of 6 hours, 15% of a radioactive material decays. What is its half-life?
a. 12.8 hrs c. 4.1 hrs b. 25.6 hrs d. 68.6 hrs