With only two exceptions, if a nucleus contains fewer ______________ than ______________, it is unstable
a. protons; neutrons
b. neutrons; protons
c. protons; alpha particles
d. protons; beta particles
b
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In which direction does the daily motion of the Moon occur in the sky, against the background stars, when viewed from the Earth?
a. toward the west b. toward the east c. toward the north celestial pole in the summer and the south celestial pole in the winter d. No predictable pattern can be discerned.
A car travels along the perimeter of a vertical circle (radius = 0.25 km) at a constant speed of 30 m/s. What is the magnitude of the resultant force on the 60-kg driver of the car at the lowest point on this circular path?
a. 0.37 kN b. 0.80 kN c. 0.22 kN d. 0.59 kN e. 0.45 kN
Which of the following is the weakest?
A) a chemical bond B) an ion-dipole attraction C) a dipole-dipole attraction D) a dipole-induced dipole attraction E) an induced dipole-induced dipole attraction
Identical balls oscillate with the same period T on Earth. Ball A is attached to an ideal spring and ball B swings back and forth to form a simple pendulum. These systems are now taken to the Moon, where g = 1.6 m/s2, and set into oscillation
Which of the following statements about these systems are true? (There could be more than one correct choice.) A) Both systems will have the same period on the Moon as on Earth. B) On the Moon, ball A will take longer to complete one cycle than ball B. C) On the Moon, ball B will take longer to complete one cycle than ball A. D) On the Moon, ball A will execute more vibrations each minute than ball B. E) On the Moon, ball B will execute more vibrations each minute than ball A.