Consider a main-sequence star, a white dwarf, a neutron star, and the singularity of a black hole. Which of the following lists them in the correct order of increasing density (low to high)?
A) main sequence star, white dwarf, neutron star, black hole singularity
B) main sequence star, neutron star, white dwarf, black hole singularity
C) black hole singularity, main sequence star, white dwarf, neutron star
D) main sequence star, black hole singularity, neutron star, white dwarf
A) main sequence star, white dwarf, neutron star, black hole singularity
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Energy and Momentum: An 8.0-g bullet is suddenly shot into a 4.0-kg block that is at rest on a frictionless horizontal surface, as shown in the figure. The bullet remains lodged in the block. The block then moves against a spring and compresses it by 3.7 cm. The force constant (spring constant) of the spring is 2500 N/m. What was the initial speed v of the bullet?
A. 460 m/s B. 440 m/s C. 480 m/s D. 500 m/s E. 520 m/s
Regarding the validity of the law of conservation of energy,
A) it is valid for any situation in which Newtonian physics is valid, but is often incorrect outside of that range. B) it is valid in all situations except those situations involving heat. C) this law is a consequence of Newtonian physics, and so this law is valid in every known situation because Newtonian physics is valid in every known situation. D) it is valid in every known situation--including those situations in which Newtonian physics is not valid.
State Newton's second law of motion in terms of momentum
What will be an ideal response?
The magnetic field of the Earth is believed responsible for which of the following?
a. deflection of charged cosmic rays b. ozone in the upper atmosphere c. solar flares d. deflection of both charged and uncharged cosmic rays