Fusion occurs in __________ numbers of atomic mass nuclei whereas fission occurs in ___________ numbers of atomic mass nuclei up to _________
a. high, low, uranium b. low, high, uranium
c. high, low, iron d. low, high, iron
d
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Three solid, uniform, cylindrical flywheels, each of mass 65.0 kg and radius 1.47 m rotate independently around a common axis. Two of the flywheels rotate in one direction at 3.83 rad/s; the other rotates in the opposite direction at 3.42 rad/s
Calculate the magnitude of the net angular momentum of the system. A) 298 kg • m2/s B) 778 kg • m2/s C) 257 kg • m2/s D) 222 kg • m2/s
Starting from rest, a car accelerates down a straight road with constant acceleration a1 for a time t1, then the acceleration is changed to a different constant value a2 for an additional time t2 . The total elapsed time is t1 + t2 . Can the equations for motion with constant acceleration be used to find the total distance traveled?
a. No, because this is not a case of constant acceleration. b. Yes, use (a1 + a2)/2 as the average acceleration and the total time in the calculation. c. Yes, use a1 + a2 as the acceleration and the average time (t1 + t2)/2 in the calculation. d. Yes, break the problem up into 2 problems, one with the conditions for the first time interval and the other with the conditions for the second time interval, noting that for the second time interval the initial velocity is that from the end of the first time interval. When done, add the distances from each of the time intervals.
How much work must be done by frictional forces in slowing a 1000-kg car from 26m/s to rest?
A) 3.41 × 105 J B) 2.73 × 105 J C) 4.09 × 105 J D) 4.77 × 105 J
What is the formula mass of ammonium phosphide, (NH4)3P?
a. 85.0 u b. 49.0 u c. 48.0 u d. 57.0 u