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.
d
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Consider the first major feature (orderly motions). Which of the following correctly describe patterns of motion in our solar system?
A. Major moons generally have polar orbits, meaning orbits that take them over the north and south poles of the planet they orbit. B. All the planets orbit the Sun in nearly the same plane. C. The outer planets are so large that they nearly collide with each other on each orbit. D. Inner planets orbit the Sun in the opposite direction from the outer planets. E. The Sun and most of the planets rotate in the same direction that the planets orbit. F. Planets have nearly circular orbits.
Suppose that you wish to construct a simple ac generator having an output of 12 V maximum when rotated at 60 Hz. A uniform magnetic field of 0.050 T is available. If the area of the rotating coil is 100 cm2, how many turns do you need?
A) 8 B) 16 C) 32 D) 64 E) 128
Humans have not sent a spacecraft into the interior of the Sun to confirm any models of the interior. What evidence then do we have to support our current ideas about the solar interior?
A) solar neutrinos B) solar flares C) sun spots D) X-ray observations that penetrate the gas E) We have no evidence, just informed guesses.
The idea that the speed of light is absolute is supported by experimental evidence
Indicate whether the statement is true or false