What is meant by local average velocity?
What will be an ideal response?
The term local average velocity refers to a velocity at a particular location in a
mixture where the substances making up the mixture each have a velocity and
the average velocity is based on the mass, or the momentum of the
components.
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The Milky Way and other spiral galaxies ____
a. must have formed recently, because they contain young stars b. formed spiral arms as the result of major collisions with other galaxies c. created their disks through the process of galactic cannibalism d. must be very old because they contain so much gas and dust e. cannot maintain their disk structure if they suffer a major collision
Consider a situation where you carry a 20-N box up a flight of stairs, raising its elevation by 5 m.When the box hits the floor its kinetic energy is converted into internal energy
a. True b. False Indicate whether the statement is true or false
What is the maximum radiation pressure exerted by sunlight in space (S = 1350 W/m2) on a highly polished silver surface?
A. 1.4 × 10?2 Pa B. 0.12 Pa C. 9.0 × 10?6 Pa D. 4.5 × 10?5 Pa E. 2.3 × 10?6 Pa
Galactic collisions are believed to be commonplace
Indicate whether the statement is true or false