The most important property that determines the evolution of a star is its
A. composition.
B. mass.
C. temperature.
D. location.
Answer: B
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A 20.0 kg box slides down a 12.0 m long incline at an angle of 30.0 degrees with the horizontal. A force of 50.0 N is applied to the box in the upward direction. The applied force F makes an angle of 0.00 to the incline. If the incline has a coefficient of kinetic friction of 0.000, then the increase in the kinetic energy of the box is
A. 620 J. B. 576 J. C. 542 J. D. 500 J. E. 475 J.
The focal length of a thin lens is 40 mm and its aperture diameter is 10 mm. What is the f-number of this lens?
A) f/4.0 B) f/2.0 C) f/5.6 D) f/0.30 E) f/0.40
When uranium fissions into two medium-mass nuclei, the product nuclei tend to have an excess of neutrons when compared to stable nuclei. What type of radioactive decay would one expect from these product nuclei?
a. meson decay b. negative beta decay c. positive beta decay d. proton decay
Suppose two flat glass plates 30-cm long are in contact along one end and separated by a human hair at the other end. If the diameter of the hair is 50 mm, find the separation of the interference fringes when the plates are illuminated by green light, l = 546 nm