A 6.0 cm tall object is placed 20 cm in front of a convex mirror with focal -100 cm focal length. Which of the following describes the image?
A. real and inverted
B. real and upright
C. virtual and inverted
D. virtual and upright
E. not possible to determine
D. virtual and upright
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What does Einstein's cosmological constant represent in his equations of general relativity?
A) the value of the expansion rate of the universe B) the value of the acceleration of the universe C) the value that measures the strength of gravity across the universe D) the size of the cosmological horizon E) a repulsive force that can counteract gravity
Is it possible for each of three stationary charged particles to exert a force of attraction on the other two?
1.yes 2.no
The fundamental particles that are the building blocks of hadrons are __________
Fill in the blank(s) with correct word
Which is smaller?
A) a local group B) a local supercluster