The Sun lives in which component of the Milky Way?
A) a globular cluster B) the disk C) the halo D) the bulge
B
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An object 4.0 cm in height is placed 8.0 cm in front of a concave spherical mirror with a focal length of 10.0 cm. What is the position of its image in relation to the mirror, and what are the characteristics of the image?
A) 10.0 cm on the same side of mirror, real, 6.0 times bigger B) 10.0 cm on the other side of mirror, virtual, 10.0 times bigger C) 40.0 cm on the other side of mirror, real, 6.0 times bigger D) 40.0 cm on the other side of mirror, virtual, 5.0 times bigger E) 18.0 cm on the same side of mirror, virtual, 2.25 times bigger
Thermodynamic Processes: The process shown on the pV diagram in the figure is an
A. adiabatic expansion. B. isothermal expansion. C. isometric expansion. D. isobaric expansion.
A plane wall 15 cm thick has a thermal conductivity given by the relation k = 2.0 + 0.0005 T W/(m K) where T is in degrees Kelvin. If one surface of this wall is maintained at 150 °C and the other at 50 °C, determine the rate of heat transfer per square meter. Sketch the temperature distribution through the wall.
GIVEN
A plane wall
Thickness (L) = 15 cm = 0.15 m
Thermal conductivity (k) = 2.0 + 0.0005 T W/(m K) (with T in Kelvin)
Surface temperatures: Th = 150 °C Tc = 50 °C
FIND
(a) The rate of heat transfer per square meter (q/A)
(b) The temperature distribution through the wall
ASSUMPTIONS
The wall has reached steady state
Conduction occurs in one dimension
SKETCH
What is the maximum kinetic energy (in eV) of a photoelectron when a surface, whose work function is 5.0 eV, is illuminated by photons whose wavelength is 400 nm?
a. 3.1 b. ?1.9 c. 1.9 d. 0 e. 1.2