What three factors affect porosity?
What will be an ideal response?
Answer: Porosity is the ratio of total volume of pore spaces in a soil or rock to total volume of soil or rock. Porosity is affected by the size, shape, and packing of particles.
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Prior to decoupling, all matter was ________, with free electrons and nuclei
Fill in the blank(s) with correct word
Cosmic rays are electromagnetic radiation
a. True b. False Indicate whether the statement is true or false
What eventually halts the gravitational collapse of an interstellar gas cloud that forms a brown dwarf rather than a true (main-sequence) star?
A) The central object becoming hot enough to sustain nuclear fusion in its core B) Degeneracy pressure caused by the high density of electrons in the core C) Thermal pressure from the high core temperature D) The onset of convection in the object's outer layers
While running, a person dissipates about 0.6 J of mechanical energy per step per kilogram of body mass. If a 60-kg person runs with a power of 70 watts during a race, how fast is the person running? Assume a running step is 1.5 m long.
What will be an ideal response?