A 6.00 kg mass is located at (1.0 m, –2.00 m, 3.00 m), a 5.00 kg mass is located at (1.0 m, 3.00 m, – 2.00 m), and a 4.00 kg mass is located at (–1.0 m, –2.00 m, 2.00 m). The center of gravity of the system of masses is
A. (5/15m, -1/15m, 17/15m).
B. (5/15m, -17/15m, 5/15m).
C. (12/15m, -5/15m, 16/15m).
D. (7/15m, -5/15m, 16/15m).
E. (16/15m, -1/15m, 17/15m).
D. (7/15m, -5/15m, 16/15m).
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Two people, each of 70 kg mass, are riding in an elevator. One is standing on the floor. The other is hanging on a rope suspended from the ceiling. Compare the force 
the floor exerts on the first person to the force 
the rope exerts on the second person. Which statement is correct?
A.
B.
C.
is greater than , but they have the same direction.D.
is greater than , but they have opposite directions.E.
is less than , but they have the same direction.A spring-loaded dart gun is used to shoot a dart straight up into the air, and the dart reaches a maximum height of 24 meters above its point of release
The same dart is shot up a second time from the same gun, but this time the spring is compressed only half as far (compared to the first shot). How far up does the dart go this time? (Neglect friction and assume the spring is ideal and massless.) A) 6.0 m B) 12 m C) 3.0 m D) 48 m
Because the factor h on the right side of the Heisenberg uncertainty principle has units of Joule-seconds, it suggests that the energy of a system also has uncertainty. The uncertainty in energy depends on the length of the time interval during which a system exists. ?E?t ? h/4?. Suppose an unstable mass is produced during a high-energy collision such that the uncertainty in its mass is
me/100 . (me = 9.11 × 10^?31 kg.) How long will this particle exist? a. 6.4 × 10^?20 s b. 2.3 × 10^?23 s c. 1.0 × 10^15 s d. 1.2 × 10^13 s e. 8.1 × 10^?19 s
Compared to its size, the Sun is very far away from all other stars
Indicate whether the statement is true or false