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 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
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 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