Suppose a power plant uses a Carnot engine to generate electricity, using the atmosphere at 300 K as the low-temperature reservoir. Suppose the power plant produces 1 × 10^6 J of electricity with the hot reservoir at 500 K during Day One and then produces 1 × 10^6 J of electricity with the hot reservoir at 600 K during Day Two. The thermal pollution was
a. greatest on Day One.
b. greatest on Day Two.
c. the same on both days.
d. zero on both days.
a
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Electrons are used to produce X-rays by allowing a beam of electrons to strike a heavy metal surface. When the intensity of the electron beam is increased, this results in:
A. X-rays being produced having longer wavelength B. X-rays being produced having higher energy C. More X-rays produced per unit time D. Faster X-rays being produced
Find the final equilibrium temperature when 20.0 g of milk at 10.0°C is added to 160 g of coffee at 90.0°C. (Assume the specific heats of coffee and milk are the same as water and neglect the heat capacity of the container, and cwater = 1.00 cal/g•°C = 4186 J/kg•°C)
a. 85.3°C c. 71.4°C b. 81.1°C d. 66.7°C
A thin spherical shell of radius 20.0 cm has 5.0 ?C of charge uniformly distributed over its surface. What is the magnitude of the electric field 2.00 m from the center of the sphere?
a. 
b. 
c. 
d. 
e. 0
Angular Quantities: The sun subtends an angle of 0.00928 rad when viewed from the surface of the earth, and its distance from Earth is 1.5 × 1011 m. What is the diameter of the sun?
Fill in the blank(s) with the appropriate word(s).