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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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
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
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
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.