If the sum of the external forces on an object is zero, then the sum of the external torques on it must also be zero
A) True B) False
B
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Two masses are connected by a string which passes over pulley with negligible mass and friction. One mass hangs vertically and one mass slides on a 30.0 degrees frictionless incline. The vertically hanging mass is 4.00 kg and the mass on the incline is 6.00 kg. The acceleration of the 4.00 kg mass is
A. 2.98 
B. 3.92
C. 5.75
D. 6.86
E. 7.84
If a = 3.0 mm, b = 4.0 mm, Q1 = ?60 nC, Q2 = 80 nC, and q = 30 nC in the figure, what is the magnitude of the electric force on q?
a.
1.4 N
b.
1.0 N
c.
1.7 N
d.
2.0 N
e.
0.50 N
Adiabatic Processes: A monatomic ideal gas at an initial temperature of 390 K is compressed adiabatically from an initial volume of 120 L to a final volume of 40.0 L. What is the final temperature of the gas?
A. 124 K B. 811 K C. 610 K D. 775 K E. 820 K
Two wires with the same resistance have the same diameter but different lengths. If wire 1 has length L1 and wire 2 has length L2, how do L1 and L2 compare if wire 1 is made from copper and wire 2 is made from aluminum? The resistivity of copper is 1.7 × 10^–5 W•m and the resistivity of aluminum is 2.82 × 10^–5 W•m
a. L1 = 0.36 L2 c. L1 = 0.60 L2 b. L1 = 2.8 L2 d. L1 = 1.7 L2