Two masses are connected by a cord that passes over a pulley as shown in the figure. The pulley and cord have negligible mass and 
(2.0 kg) moves on a horizontal surface without friction, 
(2.0 kg) is suspended vertically. What is the acceleration of 
?
A. 3.9 
B. 12
C. 6.0
D. 4.9
D. 4.9
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Conservation of Momentum: A 1200-kg ore cart is rolling at 10.8 m/s across a flat friction-free surface. A crane suddenly drops 858 kg of ore vertically into the cart. How fast does the cart move just after being loaded with the ore?
A. 6.30 m/s B. 3.80 m/s C. 4.20 m/s D. 5.70 m/s
Series/Parallel Circuits: A certain 20-A circuit breaker trips when the current in it equals 20 A. What is the maximum number of 100-W light bulbs you can connect in parallel in an ideal 120-V dc circuit without tripping this circuit breaker?
A. 11 B. 17 C. 23 D. 27
The toy drinking bird nicely illustrates
A) evaporation. B) condensation. C) both of these D) neither of these
Short-period comets, such as Halley's Comet, are believed to come from the ______________
Fill in the blank(s) with correct word