Find the minimum diameter of a steel wire 18 m long that will stretch no more than 9 mm when a load of 380 kg is hung on the lower end. (Y steel = 2.0 × 10^11 N/m2)
6.89 mm
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Which expands more when the temperature is lowered? Equal volumes of
A) iron. B) wood. C) helium. D) water at 4°C. E) none expand when the temperature is lowered
Our surveys of the Galactic Center are better done in infrared than visible light
Indicate whether the statement is true or false
Radioactivity Basics: The nuclei of 
He are also known as
A. ? particles. B. ? particles. C. ? rays. D. x-rays. E. positrons.
A lithium atom, mass 1.17 × 10-26 kg, vibrates with simple harmonic motion in a crystal lattice, where the effective force constant of the forces on the atom is k = 49.0 N/m
(c = 3.00 × 108 m/s, h = 6.626 × 10-34 J ? s, h = 1.055 × 10-34 J ? s, 1 eV = 1.60 × 10-19 J) (a) What is the ground state energy of this system, in eV? (b) What is the wavelength of the photon that could excite this system from the ground state to the first excited state? What will be an ideal response?