Thermodynamic Devices: A reversible engine takes in heat at a rate of 555 W and exhausts heat at 482 W.(a) How much power does it produce?(b) What is its efficiency?(c) If operated in reverse as a refrigerator, what would be its performance coefficient (COP)?
What will be an ideal response?
(a) 73 W (b) 13.2% (c) 6.6
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Suppose a uniform electric field of 4 N/C is in the positive x direction. When a charge is placed at and fixed to the origin, the resulting electric field on the x axis at x = 2 m becomes zero. What is the magnitude of the electric field at x = 4 m on the x axis at this time?
a. 0 b. 1 N/C c. 2 N/C d. 4 N/C e. More information is needed to find the resulting field magnitude at this position.
A resistor of unknown resistance and a 15-W resistor are connected across a 20-V emf in such a way that a 2.0 A current is observed in the emf. What is the value of the unknown resistance?
a. 75 W b. 12 W c. 7.5 W d. 30 W e. 5.0 W
A set of twins, Andrea and Courtney, are initially 10 years old
While Courtney remains on Earth, Andrea rides on a spaceship which travels away from Earth at a speed of 0.60c for five years (as measured by Courtney), then immediately turns around and comes back at 0.60c. When Andrea returns, Courtney is 20 years old. How old is Andrea upon her return? A) 10 y B) 12 y C) 15 y D) 18 y E) 20 y
Using a capacitor and two different value resistors, which of the following combinations in an RC circuit would give the greatest time constant?
a. the capacitor in series with both resistors in series with each other b. the capacitor in series with both resistors in parallel with each other c. the capacitor in series with the higher value resistor d. the capacitor in series with the lower value resistor