In the equation ac= v2/r for centripetal acceleration, the r stands for
a. diameter.
b. distance.
c. radius.
d. rate.
c
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Which of the following statements is true of a carbon nucleus?
A) It has six times more positive electric charge than hydrogen. B) It has a lower Coulomb barrier than hydrogen. C) It has more protons as compared with oxygen nucleus. D) It has more protons as compared with nitrogen nucleus.
Two harmonic waves are described by 
From the choices given, determine the smallest positive value of x (in cm) corresponding to a node of the resultant standing wave.
A. 3 B. 0.25 C. 0 D. 6 E. 1.5
When a drag strip vehicle reaches a velocity of 60 m/s, it begins a negative acceleration by releasing a drag chute and applying its brakes. While reducing its velocity back to zero, its acceleration along a straight line path is a constant -6.0 m/s2 . What displacement does it undergo during this deceleration period?
a. 120 m c. 320 m b. 300 m d. 240 m
Tritium (3H) has a half-life of 12.3 years and releases 0.0186 MeV energy per decay. What is the activity of a 9.0-gram sample of tritium? (NA = 6.02 × 10^23 mol–1, 1 year = 3.16 × 10^7 s, 1 MeV = 1.6 × 10^–13 J, and mt = 3.01605 u)
a. 1.3 × 10^16 Bq c. 3.6 × 10^14 Bq b. 1.1 × 10^15 Bq d. 3.2 × 10^15 Bq