A speed of 60 mi/h is closest to which of the following? (2.54 cm = 1.00 in.)
A) 60 m/s
B) 20 m/s
C) 30 km/h
D) 120 m/s
E) 30 m/s
E
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An object is placed 10 cm in front of a mirror, and an image is formed that has a magnification of 2 . Which of the following statements is false?
a. The focal length of the mirror is 20 cm. b. The image is virtual. c. There is enough information to select the correct answer. d. This is the only true statement.
The brightest planet has an apparent magnitude of about – 4 and is named
a. Jupiter. b. Saturn. c. Mars. d. Venus.
Globular clusters are too small to have black holes at their center
Indicate whether the statement is true or false
Refracting Telescope: To maximize the magnification of a refracting telescope, what lenses should you choose?
A. The objective lens and eyepiece should both have small focal lengths. B. The objective lens and eyepiece should both have large focal lengths. C. The objective lens should have a small focal length and the eyepiece should have a large focal length. D. The objective lens should have a large focal length and the eyepiece should have a small focal length. E. The objective lens should have a large focal length, but it doesn't matter what the focal length of the eyepiece is.