An object is placed a distance d in front of a plane mirror. The size of the image will be
A) dependent on the distance d.
B) half as big as the size of the object.
C) twice the size of the object.
D) dependent on where you are positioned when you look at the image.
E) the same size as the object, independent of the distance d or the position of the observer.
E
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Which statement about Jupiter is true?
A. It is more massive than all other planets combined. B. It may become a star in about a billion years. C. It is the least dense of the Giant Planets. D. It has a solid core of ice about 1,000 km under the visible surface.
Giant and supergiant stars are rare because
a. they do not form as often as main sequence stars. b. the star blows up before the giant or supergiant stage is reached c. the giant or supergiant stage is very short. d. the giant or supergaint stage is very long
An iron core in a transformer
A) guides magnetic field lines. B) shields unwanted external electric or magnetic fields. C) separates the primary and secondary regions. D) reduces energy losses.
A heat engine is any device that changes mechanical work into thermal energy
Indicate whether the statement is true or false