Define the term viscosity.
What will be an ideal response?
Viscosity is the index of the resistance of a fluid to velocity. When multiplied by
the velocity gradient of the fluid sliding past a surface, the gradient being
normal or perpendicular to the surface a fluid flow, results in the shear stress or
frictional resistance per unit area.
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The solar nebula theory is NOT able to explain which of the following observed characteristics of the solar system?
a. common direction of rotation of the planets b. common direction of revolution of the planets c. the formation of hydrogen atoms in the solar system from subatomic particles d. the density of the Jovian planets
Photon Energy: For what wavelength does a 100-mW laser beam deliver 1.6 × 1017 photons in one second? (c = 3.0 × 108 m/s, h = 6.626 × 10-34 J ? s)
A. 320 nm B. 330 nm C. 340 nm D. 350 nm
A He-Ne laser, which produces light of wavelength 632.8 nm, is used to calibrate a diffraction grating. If the first-order maximum occurs at 20.5° from the central spot, what is the distance between the slits of the grating?
A) 0.905 µm B) 1.81 µm C) 2.20 µm D) 3.62 µm E) 4.52 µm
A possible means of spaceflight is to place a perfectly reflecting aluminized sheet into Earth orbit and use the light from the sun to push this solar sail. If a huge sail of area 6.00 × 10^5 m2 and mass 6 000 kg were placed into orbit and turned toward the sun, what would be the force exerted on the sail? (Assume a solar intensity of 1 380 W/m2.)