This diagram represents the life track of a 1 solar-mass star from its pre-main-sequence stages to just before its final death. Refer to the life stages labeled with roman numerals. During which stage does the star have an inert (nonfusing) helium core?
A) Stage iii
B) Stage iv
C) Stage vi
D) Stage vii
E) Stage viii
B) Stage iv
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A certain speed boat weighs 4,900 N. It can accelerate from 0 to 20 m/s in 5 seconds. (a) What is the mass of the boat? (b) What is the acceleration? (c) How large is the net force acting on the boat?
An apparatus for measuring the mechanical equivalent of heat uses a crank to turn a small aluminum cylinder, which is being retarded by a belt
Friction with the belt heats up the cylinder, and the work done is then set equal to the heat gained by the cylinder. In one such experiment, the radius of the cylinder is 3.00 cm, the tension on one side of the belt is 50.0 N and on the other it is zero N. How much work is done turning the crank 212 times? A) 2000 J B) 4000 J C) 19600 J D) 637 J E) 9800 J
An empirical interatomic pair potential for xenon atoms, in units of eV, and nm, has been determined to be
The lattice parameter of FCC xenon is equal to 0.630 nm.
(a) Determine the equilibrium pair bonding energy.
(b) Determine the cohesive energy of a xenon crystal at 0 kelvin using only the nearestneighbor interactions, and compare your result with the value in the periodic table.
Comment on any observed difference.
A slit of variable width illuminated by light of wavelength ? is widened until the first order diffraction minimum moves out to a distance infinitely far away from the brightest location in the central maximum. In terms of the wavelength, the width of the slit is then
A.
B.
.C.
D.
.E.