The typical density and temperature of molecular clouds are
A) 100 molecules per cubic centimeter, 10-30 Kelvin.
B) 300 molecules per cubic centimeter, 10-30 Kelvin.
C) 1000 molecules per cubic centimeter, 10-30 Kelvin.
D) 100 molecules per cubic centimeter, 100-300 Kelvin.
E) 300 molecules per cubic centimeter, 100-300 Kelvin.
B
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Normal atmospheric pressure is
a. 14.7 psi b. 1 N/m2 c. zero d. 760 mm of mercury e. 101,000 pascals f. none of the above
Under what conditions is an object weightless?
What will be an ideal response?
Which person’s watch or clocks register(s) a coordinate time between those events in some inertial frame?
A. Alice B. Bob C. Carol D. Alice and Bob E. Bob and Carol F. Alice and Carol T. All three observers
______________ is the apparent motion that occurs between two fixed objects when the observer changes position
Fill in the blank(s) with correct word