Which statement about antimatter is not true?
A) Antimatter has been hypothesized to exist but has never actually been detected.
B) An antielectron (positron) is identical to an ordinary electron except it has a positive charge.
C) Every ordinary particle has a corresponding antiparticle.
D) When a particle and its antiparticle meet, the result is mutual annihilation that turns all of the mass into energy.
A) Antimatter has been hypothesized to exist but has never actually been detected.
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Kinetic Energy: Which one has larger kinetic energy: a 500-kg object moving at 40 m/s or a 1000-kg object moving at 20 m/s?
A. The 500-kg object B. The 1000-kg object C. Both have the same kinetic energy.
Which of the following lists the two key predictions of the Big Bang model that have been verified by observations?
A) (1) the existence of the cosmic microwave background and (2) the amount of helium relative to hydrogen in the universe B) (1) the existence of the cosmic microwave background and (2) the existence of dark matter C) (1) the existence of the cosmic microwave background and (2) the near-critical density of the universe D) (1) the predominance of matter over antimatter and (2) the near-critical density of the universe E) (1) the predominance of matter over antimatter and (2) the large-scale structure of galaxies
Consider an orbit where rc = 1 AU and b = 2 AU. What kind of orbit is this?
A. Circular B. Elliptical C. Parabolic D. Hyperbolic
A 1-kg ball is thrown at 10 m/s straight upward. Neglecting air resistance, the net force that acts on the stone when it is halfway to the top of its path is about
A) 1/2 N. B) 1 N. C) 5 N. D) 7.5 N. E) 10 N.