If an electron is accelerated from rest through a potential difference of 9.9 kV, what is its resulting speed? (e = 1.60 × 10-19 C, k = 1/4??0 = 8.99 × 109 N ? m2/C2, mel = 9.11 x 10-31 kg)
A) 3.9 × 107 m/s B) 5.9 × 107 m/s C) 2.9 × 107 m/s D) 4.9 × 107 m/s
B
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Buoyancy: A 50-cm3 block of wood is floating on water, and a 50-cm3 chunk of iron is totally submerged in the water. Which one has the greater buoyant force on it?
A. the wood B. the iron C. Both have the same buoyant force. D. It cannot be determined without knowing their densities.
What is the most important factor that determines the thickness, and therefore strength, of the lithosphere?
A) pressure B) viscosity C) composition D) internal temperature E) distance of planet from Sun
The ozone layer absorbs which of the following wavelengths of radiation?
What will be an ideal response?
The louvered box that serves as a thermometer shelter at a weather station is known as which of the following?
What will be an ideal response?