If life is to develop on a planet, the planet must lie well inside the inner edge of its star's habitable zone
Indicate whether the statement is true or false
F
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Determine
(a) For copper, determine the energies at which the probability of electron occupation is 0.9 and 0.1 at 300 K. (b) Are these energies symmetric about the Fermi energy of 7.04 eV?
A rectangular plate (a 5 120 mm, b 5 160 mm) is subjected to compressive stress ?x 5 24.5 MPa and tensile stress ?y 5 15 MPa. The ratio of the normal stress acting perpendicular to the weld to the shear stress acting along the weld is approximately:
(A) 0.27
(B) 0.54
(C) 0.85
(D) 1.22
Latitude is the angular measurement in degrees
a. east or west of the prime meridian. b. north or south of the prime meridian. c. north or south of the equator. d. north or south of the celestial equator.
A wheel rotating about a fixed axis has a constant angular acceleration of 4.0 rad/s2 . In a 4.0-s interval the wheel turns through an angle of 80 radians. Assuming the wheel started from rest, how long had it been in motion at the start of the 4.0-s interval?
a. 2.5 s b. 4.0 s c. 3.5 s d. 3.0 s e. 4.5 s