An object is placed 15.0 cm to the left of a double-convex lens of focal length 20.0 cm. The image of this object is located
A) 60.0 cm to the right of the lens.
B) 60.0 cm to the left of the lens.
C) 8.57 cm to the right of the lens.
D) 8.57 cm to the left of the lens.
E) 30.0 cm to the left of the lens.
B
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The wind speed of the air flowing over a 16-cm-diameter outside mirror is significantly higher than the speed of a vehicle. If the pressure on the front of the mirror is assumed to be stagnation pressure and the pressure on the rear is assumed to be atmospheric, the power needed to move the mirror, if the air velocity around the mirror is 30 m/s, is nearest:
(A) 0.44 hp (B) 0.39 hp (C) 0.34 hp (D) 0.29 hp
The North Celestial Pole is 35 ? above your northern horizon. This tells you that:
a. you are at latitude 35 ? N. b. you are at longitude 35 ? E. c. you are at latitude 35 ? S.
The product of a radioactive decay is called the "daughter."
a. True b. False Indicate whether the statement is true or false
Which of the following is NOT one of the four stages in the development of a terrestrial planet?
a. flooding b. cratering c. slow surface evolution d. fusion of hydrogen to helium e. differentiation