A concave mirror has a focal length of 20 cm. A paraxial beam of light coming from a distant object forms its image at the focal point
If a small plane mirror is placed at the center of curvature with its reflecting side facing the focal point, where is the final image? A) 3 cm in front of the mirror
B) 40 cm in front of the mirror
C) 50 cm in front of the mirror
D) 60 cm in front of the mirror
E) 70 cm in front of the mirror
D
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A projectile is thrown from the top of a building with an initial velocity of 30 m/s in the horizontal direction. If the top of the building is 30 m above the ground, how fast will the projectile be moving just before it strikes the ground?
A. 35 m/s B. 39 m/s C. 31 m/s D. 43 m/s E. 54 m/s
The special theory of relativity predicts that there is an upper limit to the speed of an object. It therefore follows that there is also an upper limit on which of the following properties of the object?
(There could be more than one correct choice.) A) The kinetic energy of the object. B) The total energy of the object. C) The linear momentum of the object. D) None of the above.
What is the valence shell?
A) It is the outermost shell of electrons in an atom. B) It is the shell of electrons in an atom that is the least reactive. C) It is the last partially filled orbital in an atom. D) It is the shell of electrons in element V (atomic no. = 23). E) It is the same as the orbital configuration.
When uranium-238 (Z = 92) is bombarded with a neutron, it can change into __________
Fill in the blank(s) with correct word