How does the mass of a giant star compare with the mass of the black hole it may become? How do the densities compare?
What will be an ideal response?
Answer: The masses are the same! A black hole is a collapsed star, with its mass enormously compressed, but not increased. The density of a black hole is enormously greater, but not because of more mass, but because of less volume.
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The energy of a particle in the second EXCITED state of a harmonic oscillator potential is
What is the classical angular frequency of oscillation of this particle? (1 eV = 1.60 × 10-19 J, h = 1.055 × 10-34 J ? s, h = 6.626 × 10-34 J ? s) A) 3.31 × 1015 rad/s B) 2.08 × 1016 rad/s C) 4.96 × 1015 rad/s D) 6.95 × 1015 rad/s
A car travels around an unbanked highway curve (radius 0.15 km) at a constant speed of 25 m/s. What is the magnitude of the resultant force acting on the driver, who weighs 0.80 kN?
a. 0.87 kN b. 0.34 kN c. 0.80 kN d. 0.00 kN e. 0.67 kN
The stimulated emission of photons from the excited atoms in a gas laser is prompted by which of the following?
a. nearby presence of photons of same wavelength as those emitted b. high flux of electrons c. high voltage d. high temperature
Identify (name) the 12 leptons:
What will be an ideal response?