What element are white dwarfs made of? Why?
What will be an ideal response?
White dwarfs consist mainly of carbon, the product of the triple alpha process. Its gravitational contraction is not sufficient to make the 600 million K needed to fuse two carbon nuclei.
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The shortest wavelength of visible light is _____
A) 300 nanometers B) 400 nanometers C) 500 nanometers D) 600 nanometers
In the inductor of a 59-Hz AC series circuit, the peak voltage precedes the peak current in each cycle by what time interval?
a. 1.7E–2 s b. 4.2E–3 s c. 8.5E–3 s d. 3.4E–2 s e. 6.8E–2 s
What are the two fundamental laws that lie at the heart of quantum mechanics?
A) (1) the uncertainty principle and (2) the exclusion principle B) (1) the absoluteness of the speed of light and (2) the equivalence principle C) (1) the law of conservation of energy and (2) the electromagnetic force law D) (1) the law of conservation of angular momentum and (2) the law of conservation of energy
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