Two forces act on a 4.00-kg object in a manner that the object has an acceleration 3.00 m/s2 in a direction 20.0° north of east. The first force is 15.00 N in a direction 10.0° west of north. What is the second force?
A) 14.6 N in a direction 28.1° south of east
B) 12.9 N in a direction 28.1° south of east
C) 16.2 N in a direction 30.2° south of east
D) 18.8 N in a direction 41.1° south of east
E) 17.5 N in a direction 37.5° south of east
E
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Free Fall: A 10-kg rock and 20-kg rock are dropped from the same height and experience no significant air resistance. If it takes the 20-kg rock a time T to reach the ground, what time will it take the 10-kg rock to reach the ground?
A. 4T B. 2T C. T D. T/2 E. T/4
One consequence of Einstein's theory of special relativity is that
A) absolute Earth velocity can be measured. B) absolute velocity of stars can be measured with respect to the ether wind. C) simultaneity is not absolute. D) relative speed can not be measured. E) nothing is conserved because it changes.
In general, as the yield strength of a given alloy increases, the ductility _________.
Fill in the blank(s) with the appropriate word(s).
A battery's "voltage" is
A) the amount of electrical current it produces. B) the amount of electrical resistance it can overcome. C) the amount of energy it gives to each coulomb of electrical charge. D) the amount of kinetic energy it gives to each electron. E) the amount of electrical charge it can send around an electrical circuit in every second.