When you shuffle your feet on a carpet on a dry day, you can accumulate a charge. The fact that you accumulate a charge means that the carpet is
A. an insulator, because if it weren't, the charge would immediately leave you.
B. a conductor, because conductors always have extra electrons.
C. an insulator, because only insulators can be charged by contact.
D. a conductor, because charge cannot leave an insulator and move to you.
Answer: A
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An object undergoing free fall experiences
A. an increase in both its acceleration and velocity B. a decrease in its acceleration and an increase in its velocity C. a constant acceleration and an increase in its velocity.
Jupiter completes one revolution about its own axis every 9.92 hours. What is the radius of the orbit required for a satellite to revolve about Jupiter with the same period? Jupiter has a mass of 1.90 × 1027 kg and G = 6.67 × 10-11 N ? m2/kg2
A) 1.04 × 107 m B) 2.26 × 109 m C) 1.60 × 108 m D) 3.41 × 108 m E) 7.45 × 108 m
The distinction between impulse and force involves the
A) distance the force acts. B) time the force acts. C) difference between acceleration and velocity. D) mass and its effect on resisting a change in momentum.
___________ of the Milky Way contains mostly old (population II) stars and globular clusters
a. The disk component b. The spherical halo component c. The hydrogen gas in the disk d. The spiral arms e. Sgr A