Main-sequence stars have about the same density as the Sun but giant stars have very low densities
a. True
b. False
Indicate whether the statement is true or false
True
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An atom that is excited
a. is also ionized. b. is an isotope. c. has had its electron moved to the lowest energy level. d. can emit a photon when the electron moves to a lower energy level. e. can emit a photon when the electron moves to a higher energy level.
Constant Acceleration Kinematics: An airplane starts from rest and accelerates at a constant 10.8 m/s2. What is its speed at the end of a 400 m-long runway?
A. 37.0 m/s B. 93.0 m/s C. 65.7 m/s D. 4320 m/s E. 186 m/s
Two pipe columns are required to have the same Euler buckling load Pcr. Column 1 has flexural rigidity EI1 and height L; column 2 has flexural rigidity (2/3)EI2 and height L. The ratio (I2/I1) at which both columns will buckle under the same load is approximately:
(A) 0.8
(B) 1.0
(C) 2.2
(D) 3.1
If we learn that the universe is a recollapsing universe, it will mean that the universe is presently contracting, rather than expanding as generally believed
Indicate whether the statement is true or false