Blue stars emit most of their energy at shorter wavelengths than red stars
a. True
b. False
Indicate whether the statement is true or false
True
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A copper tube with wall thickness of 8 mm must carry an axial ten-sile force of 175 kN. The allowable tensile stress is 90 MPa. The minimum required outer diameter is approximately:
(A) 60 mm
(B) 72 mm
(C) 85 mm
(D) 93 mm
What combination of quarks produces a neutron and what are the electric charges on these quarks, expressed in terms of e?
What will be an ideal response?
Species are groups of organisms
A) with a common ancestor B) that are genetically distinct C) that look similar D) that are capable of interbreeding with one another
Because of Heisenberg's Uncertainty Principle, the velocity of a particle is known least precisely when the length of the wave packet representing the particle is
a. < 10-15 m. b. < 10-10 m. c. of the order of 1.00 m. d. >10 m. e. the length of a plane wave (infinite)