Atomic nuclei repel each other with a force called the _____
A) Coulomb force
B) gravitational force
C) Newtonian force
D) magnetic force
A
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Vision Problems: What is the focal length of a contact lens that will allow a person with a near point of 125 cm to read a physics book held 25.0 cm from his eyes?
A. -100 cm B. -31.3 cm C. 10.2 cm D. 20.8 cm E. 31.3 cm
Which graph best describes the x-acceleration of the object described in problem N2T.13?
A. A
B. B
C. C
D. D
E. E
A 975-kg sports car (including driver) crosses the rounded top of a hill (raduis=88.0m) at 12.0 m s. Determine
(a) the normal force exerted by the road on the car, (b) the normal force exerted by the car on the 72.0-kg driver, and (c) the car speed at which the normal force on the driver equals zero.
Why is there an upper limit to the mass of a white dwarf?
A) The more massive the white dwarf, the higher its temperature and hence the greater its degeneracy pressure. Near 1.4 solar masses, the temperature becomes so high that all matter effectively melts into subatomic particles. B) White dwarfs come only from stars with masses less than 1.4 solar masses. C) The upper limit to the masses of white dwarfs was determined through observations of white dwarfs in binary systems, but no one knows why the limit exists. D) The more massive the white dwarf, the greater the degeneracy pressure and the faster the speeds of its electrons. Near 1.4 solar masses, the speeds of the electrons approach the speed of light, and no more mass can be supported.