A dentist uses a concave mirror (focal length 2 cm) to examine some teeth. If the distance from the object to the mirror is 1 cm, what is the magnification of the tooth?
a. 6
b. 1
c. 4
d. 2
e. 1.5
D
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The south end of a bar magnet is pushed downward toward a wire loop in the plane of the paper. In which direction is the induced current, and which way is the induced magnetic field?
A. clockwise, into the paper B. clockwise, out of the paper C. counter-clockwise, into the paper D. counter-clockwise, out of the paper E. There is no induced current.
The lower limit for a main sequence star is _______________ solar masses
Fill in the blank(s) with correct word
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
A light ray in air enters and passes through a block of glass. What can be stated with regard to its speed after it emerges from the block?
a. Speed is less than when in glass. b. Speed is same as that before it entered glass. c. Speed is same as that in glass. d. Speed is less than before it entered glass.