To which group of polymers does Mylar belong?

a. Natural
b. Hydrolytic
c. Addition
d. Condensation


d

Physics & Space Science

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Light from an astronomical source is found to be shifted to a one percent lower frequency than had the source been at rest. What radial velocity could cause such a shift?

A.
m/s moving away from the observer
B.
m/s moving away from the observer
C.
m/s moving toward the observer
D.
m/s moving toward the observer
E.
m/s moving away from the observer

Physics & Space Science

This figure summarizes the geological histories of the terrestrial worlds. Based on this figure, what can you conclude?

A) The most important factor in a planet's geological history is its size. B) The most important factor in a planet's geological history is its distance from the Sun. C) We can trace almost all the key properties of a planet's geology back to the number of impacts it suffered during the heavy bombardment. D) Earth is the only planet in the inner solar system capable of harboring life.

Physics & Space Science

Olbers' paradox asks

A. Why isn't the night sky bright as day? B. How can the Universe be younger than some of the stars in it? C. If dark matter is dark, how can we ever see it? D. Which is the simplest cosmological model?

Physics & Space Science

The velocity of a body is graphed as a function of time. The slope of the graph at any point may be identified with

A. instantaneous speed. B. average velocity. C. average acceleration. D. instantaneous velocity. E. instantaneous acceleration.

Physics & Space Science