A fountain sends a stream of water 20.0 m up into the air. If the base of the stream is 10.0 cm in diameter, what power is required to send the water to this height?
30.5 kW
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If the energy of n = 6 is –0.378 eV and that of n = 4 is –0.850 eV in a hydrogen atom, a transition from n = 6 to n = 4 will emit a photon of what energy?
An iron block of density ?Fe and of volume l3 is immersed in a fluid of density ?fluid. The block hangs from a scale which reads w as the weight. The top of the block is a height h below the surface of the fluid. The correct equation for the reading of the scale is
A. w = (?Fe??fluid)ghl2. B. w = (?fluid??Fe)gl3. C. w = (?Fe??fluid)gl3. D. w = (?Fe + ?fluid)ghl2. E. w = (?Fe + ?fluid)gl3.
Jupiter and Saturn are so massive that they were able to grow by drawing in hot gas by gravitational contraction from the solar nebula
a. True b. False Indicate whether the statement is true or false
If a person has a shiny nose, applying powder will remove the shine without reducing the amount of light reflecting from the nose. This is an example of
A. polarization. B. specular reflection. C. diffuse reflection. D. diffraction.