A step-down transformer is needed to reduce a primary voltage of 120. V AC to 6.0 V AC. What turns ratio is required?
What will be an ideal response?
20:1
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Entropy: An irreversible engine operating between the temperatures of 550 K and 300 K extracts 1.20 kJ of heat from the hot reservoir and produces 0.450 kJ 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 light source radiates 60.0 W of single-wavelength sinusoidal light uniformly in all directions
What is the amplitude of the electric field of this light at a distance of 0.400 m from the bulb? (?0 = 8.85 × 10-12 C2/N ? m2, ?0 = 4? × 10-7 T ? m/A, c = 3.00 × 108 m/s) A) 162 N/C B) 212 N/C C) 82.1 N/C D) 150 N/C E) 52.9 N/C
If a spinning star suddenly gets bigger in diameter, what happens to its rotation rate?
a) It is unaffected. b) It decreases. c) It increases.
Thermodynamic Processes: When a gas expands adiabatically,
A. the internal (thermal) energy of the gas decreases. B. the internal (thermal) energy of the gas increases. C. it does no work. D. work is done on the gas. E. the temperature of the gas remains constant.