Two masses are connected by a string which passes over a pulley with negligible mass and friction. One mass hangs vertically and one mass slides on a frictionless horizontal surface. The horizontal surface has a coefficient of kinetic friction of 0.2. The vertically hanging mass is 4.00 kg and the mass on the horizontal surface is 6.00 kg. The acceleration of the 4.00 kg mass is
A. 1.98 
B. 2.74
C. 4.88
D. 6.73
E. 7.84
B. 2.74
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In drinking soda or water through a straw, we make use of
A) capillary action. B) surface tension. C) atmospheric pressure. D) Bernoulli's principle. E) none of the above
A straight 1.0-m long wire is carrying a current. The wire is placed perpendicular to a magnetic field of strength 0.20 T
If the wire experiences a force of 0.60 N, what is the current in the wire? A) 2.0 A B) 1.0 A C) 3.0 A D) 4.0 A E) 5.0 A
Two long parallel wires separated by 4.0 mm each carry a current of 24 A. These two currents are in the same direction. What is the magnitude of the magnetic field at a point that is between the two wires and 1.0 mm from one of the two wires?
a. 4.8 mT b. 6.4 mT c. 3.2 mT d. 9.6 mT e. 5.3 mT
A waning crescent moon can appear on an observer's meridian between ______________ and ______________. (Answers in times of day.)
Fill in the blank(s) with correct word