A 5.00 kg mass is located at (2.00 m, 0.00 m, 3.00 m) and a 2.00 kg mass is located at (0.00 m, 4.00 m, –2.00 m). The center of gravity of the system of masses is
A. (10/7m, 8/7m, 11/7m).
B. (11/7m, 7/7m, 8/7m).
C. (7/7m, 10/7m, 11/7m).
D. (10/7m, 7/7m, 8/7m).
E. (8/7m, 7/7m, 10/7m).
A. (10/7m, 8/7m, 11/7m).
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A brass rod with a length of 10.0 cm is placed end to end with an aluminum rod with a length of 30.0 cm and this system is placed between a hot temperature of 100
and a cold temperature of 10.0
The coefficient of thermal conductivities of the brass and the aluminum are 100 W/m C and 230 W/m
respectively. The rods have the same cross sectional area of 20.0 cm2. What is the heat flow from the hot temperature to the cold temperature?
A. 55.3 W B. 65.3 W C. 70.3 W D. 78.1 W E. 85.3 W
At t = 0, a particle leaves the origin with a velocity of 9.0 m/s in the positive y direction and moves in the xy plane with a constant acceleration of 
m/s2. At the instant the x coordinate of the particle is 15 m, what is the speed of the particle?
A. 10 m/s B. 16 m/s C. 12 m/s D. 14 m/s E. 26 m/s
A 4.0-g string is 0.39 m long and is under tension. The string vibrates at 600 Hz in its third harmonic. What is the tension in this string?
A) 250 N B) 200 N C) 160 N D) 290 N E) 340 N
If the Moon were four times as massive but twice as far from Earth, high tides on Earth would be
A) higher. B) lower. C) no different.