For the vertical 30 m high plate shown in Figure 5-26, heated in still air, estimate (a) the plate surface temperature and (b) the heat transfer per unit area.
For the vertical plate shown, the Grashof number is 5x10^6 at 10 cm up from the bottom. Assuming that the air temperature surrounding the plate is 20º C and that the temperature of the plate is constant, the Grashof number
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When an atom emits light, an electron in it moves from a higher to a lower energy level.
Answer the following statement true (T) or false (F)
A pendulum swings through a total of 28 degrees. If the displacement is equal on each side of the equilibrium position, what is the amplitude of this vibration?
a. 28 b. 14 c. 56
Calculate the kinetic energy (in eV) of a nonrelativistic neutron that has a de Broglie wavelength of 9.9 × 10-12 m. (h = 6.626 × 10-34 J • s, mneutron = 1.675 × 10-27 kg, 1 eV = 1.60 × 10-19 J)
What will be an ideal response?
A careful photographic survey of Jupiter's moon Io by the spacecraft Voyager 1 showed active volcanoes spewing liquid sulfur to heights of 70 km above the surface of this moon. If the value of g on Io is 2.0 m/s2, estimate the speed with which the liquid sulfur left the volcano
a. 260 m/s b. 530 m/s c. 790 m/s d. 970 m/s