When the alignment of the Sun, the Moon, and Earth produce a lunar eclipse, the body that is in between the other two is the
A) Sun.
B) Moon.
C) Earth.
Answer: C
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An elevator weighing 10,000. N is supported by a steel cable. Determine the tension in the cable when the elevator is accelerated upward at 3.0 m/s2. (g = 9.8 m/s2)
A) 40. kN B) 10. kN C) 7.0 kN D) 13. kN E) 11. kN
A low f-number
a. allows a smaller depth of field. b. allows using a faster shutter speed. c. causes less spherical aberration. d. is not related to any of the above options.
An atom loses its two outermost electrons. How does the resulting ion behave when it is near a positively charged transparency? How does the ion behave when it is near a negatively charged tissue?
A) The ion is repelled from both the transparency and from the tissue. B) The ion is attracted to both the transparency and to the tissue. C) The ion is attracted to the positively charged transparency, but repelled from the negatively charged tissue. D) The ion is repelled from the positively charged transparency, but attracted to the negatively charged tissue.
Two boys, Joe and Sam, who are searching for buried treasure start underneath the same tree. Joe walks 12 m east and then 12 m north, while Sam walks 15 m west and then 10 m south. Both boys then stop
Find the magnitude and direction of the vector from Sam to Joe. Express the direction of this vector by specifying the angle it makes with the west-to-east direction.