A 4.0 kg object is moving at 5.0 m/s NORTH. It strikes a 6.0 kg object at rest. The objects have an elastic collision and move in the NORTH or SOUTH direction. The velocity of the 6.0 kg object after the collision is
A. 0.0 m/s.
B. 1.0 m/s SOUTH.
C. 4.0 m/s SOUTH.
D. 1.0 m/s NORTH.
E. 4.0 m/s NORTH.
E. 4.0 m/s NORTH.
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Three resistors, each of different value, are used in a circuit with a power source supplying 12 volts. For which of the following resistor combinations is the total power supplied the greatest?
a. This cannot be found until it is known which resistor is in series with the parallel pair. b. all three resistors in series c. two of the resistors in parallel with the third resistor in series with the parallel pair d. all three resistors in parallel
A lens has a refractive power of -1.50. What is its focal length?
A. 150 cm B. -150 cm C. 67.0 cm D. -67.0 cm E. 8.50 cm
The bond between carbon atoms in the molecule acetylene, HC=CH is referred to as
A) an ionic bond B) a double bond C) a single bond D) a triple bond
Consider two copper wires. One has twice the cross-sectional area of the other. How do the resistances of these two wires compare?
A) Both wires have the same resistance. B) The thicker wire has half the resistance of the shorter wire. C) The thicker wire has twice the resistance of the shorter wire. D) none of the given answers